/*  Prototype JavaScript framework, version 1.6.0.3
 *  (c) 2005-2008 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
  Version: '1.6.0.3',

  Browser: {
    IE:     !!(window.attachEvent &&
      navigator.userAgent.indexOf('Opera') === -1),
    Opera:  navigator.userAgent.indexOf('Opera') > -1,
    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
      navigator.userAgent.indexOf('KHTML') === -1,
    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  },

  BrowserFeatures: {
    XPath: !!document.evaluate,
    SelectorsAPI: !!document.querySelector,
    ElementExtensions: !!window.HTMLElement,
    SpecificElementExtensions:
      document.createElement('div')['__proto__'] &&
      document.createElement('div')['__proto__'] !==
        document.createElement('form')['__proto__']
  },

  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

  emptyFunction: function() { },
  K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
  Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
  create: function() {
    var parent = null, properties = $A(arguments);
    if (Object.isFunction(properties[0]))
      parent = properties.shift();

    function klass() {
      this.initialize.apply(this, arguments);
    }

    Object.extend(klass, Class.Methods);
    klass.superclass = parent;
    klass.subclasses = [];

    if (parent) {
      var subclass = function() { };
      subclass.prototype = parent.prototype;
      klass.prototype = new subclass;
      parent.subclasses.push(klass);
    }

    for (var i = 0; i < properties.length; i++)
      klass.addMethods(properties[i]);

    if (!klass.prototype.initialize)
      klass.prototype.initialize = Prototype.emptyFunction;

    klass.prototype.constructor = klass;

    return klass;
  }
};

Class.Methods = {
  addMethods: function(source) {
    var ancestor   = this.superclass && this.superclass.prototype;
    var properties = Object.keys(source);

    if (!Object.keys({ toString: true }).length)
      properties.push("toString", "valueOf");

    for (var i = 0, length = properties.length; i < length; i++) {
      var property = properties[i], value = source[property];
      if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
        var method = value;
        value = (function(m) {
          return function() { return ancestor[m].apply(this, arguments) };
        })(property).wrap(method);

        value.valueOf = method.valueOf.bind(method);
        value.toString = method.toString.bind(method);
      }
      this.prototype[property] = value;
    }

    return this;
  }
};

var Abstract = { };

Object.extend = function(destination, source) {
  for (var property in source)
    destination[property] = source[property];
  return destination;
};

Object.extend(Object, {
  inspect: function(object) {
    try {
      if (Object.isUndefined(object)) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : String(object);
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
  },

  toJSON: function(object) {
    var type = typeof object;
    switch (type) {
      case 'undefined':
      case 'function':
      case 'unknown': return;
      case 'boolean': return object.toString();
    }

    if (object === null) return 'null';
    if (object.toJSON) return object.toJSON();
    if (Object.isElement(object)) return;

    var results = [];
    for (var property in object) {
      var value = Object.toJSON(object[property]);
      if (!Object.isUndefined(value))
        results.push(property.toJSON() + ': ' + value);
    }

    return '{' + results.join(', ') + '}';
  },

  toQueryString: function(object) {
    return $H(object).toQueryString();
  },

  toHTML: function(object) {
    return object && object.toHTML ? object.toHTML() : String.interpret(object);
  },

  keys: function(object) {
    var keys = [];
    for (var property in object)
      keys.push(property);
    return keys;
  },

  values: function(object) {
    var values = [];
    for (var property in object)
      values.push(object[property]);
    return values;
  },

  clone: function(object) {
    return Object.extend({ }, object);
  },

  isElement: function(object) {
    return !!(object && object.nodeType == 1);
  },

  isArray: function(object) {
    return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
  },

  isHash: function(object) {
    return object instanceof Hash;
  },

  isFunction: function(object) {
    return typeof object == "function";
  },

  isString: function(object) {
    return typeof object == "string";
  },

  isNumber: function(object) {
    return typeof object == "number";
  },

  isUndefined: function(object) {
    return typeof object == "undefined";
  }
});

Object.extend(Function.prototype, {
  argumentNames: function() {
    var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
      .replace(/\s+/g, '').split(',');
    return names.length == 1 && !names[0] ? [] : names;
  },

  bind: function() {
    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
      return __method.apply(object, args.concat($A(arguments)));
    }
  },

  bindAsEventListener: function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function(event) {
      return __method.apply(object, [event || window.event].concat(args));
    }
  },

  curry: function() {
    if (!arguments.length) return this;
    var __method = this, args = $A(arguments);
    return function() {
      return __method.apply(this, args.concat($A(arguments)));
    }
  },

  delay: function() {
    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    return window.setTimeout(function() {
      return __method.apply(__method, args);
    }, timeout);
  },

  defer: function() {
    var args = [0.01].concat($A(arguments));
    return this.delay.apply(this, args);
  },

  wrap: function(wrapper) {
    var __method = this;
    return function() {
      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    }
  },

  methodize: function() {
    if (this._methodized) return this._methodized;
    var __method = this;
    return this._methodized = function() {
      return __method.apply(null, [this].concat($A(arguments)));
    };
  }
});

Date.prototype.toJSON = function() {
  return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
  these: function() {
    var returnValue;

    for (var i = 0, length = arguments.length; i < length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) { }
    }

    return returnValue;
  }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;

    this.registerCallback();
  },

  registerCallback: function() {
    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  },

  execute: function() {
    this.callback(this);
  },

  stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
  },

  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.execute();
      } finally {
        this.currentlyExecuting = false;
      }
    }
  }
});
Object.extend(String, {
  interpret: function(value) {
    return value == null ? '' : String(value);
  },
  specialChar: {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  }
});

Object.extend(String.prototype, {
  gsub: function(pattern, replacement) {
    var result = '', source = this, match;
    replacement = arguments.callee.prepareReplacement(replacement);

    while (source.length > 0) {
      if (match = source.match(pattern)) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source  = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
  },

  sub: function(pattern, replacement, count) {
    replacement = this.gsub.prepareReplacement(replacement);
    count = Object.isUndefined(count) ? 1 : count;

    return this.gsub(pattern, function(match) {
      if (--count < 0) return match[0];
      return replacement(match);
    });
  },

  scan: function(pattern, iterator) {
    this.gsub(pattern, iterator);
    return String(this);
  },

  truncate: function(length, truncation) {
    length = length || 30;
    truncation = Object.isUndefined(truncation) ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
  },

  strip: function() {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  },

  stripTags: function() {
    return this.replace(/<\/?[^>]+>/gi, '');
  },

  stripScripts: function() {
    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  },

  extractScripts: function() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
  },

  evalScripts: function() {
    return this.extractScripts().map(function(script) { return eval(script) });
  },

  escapeHTML: function() {
    var self = arguments.callee;
    self.text.data = this;
    return self.div.innerHTML;
  },

  unescapeHTML: function() {
    var div = new Element('div');
    div.innerHTML = this.stripTags();
    return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
  },

  toQueryParams: function(separator) {
    var match = this.strip().match(/([^?#]*)(#.*)?$/);
    if (!match) return { };

    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var key = decodeURIComponent(pair.shift());
        var value = pair.length > 1 ? pair.join('=') : pair[0];
        if (value != undefined) value = decodeURIComponent(value);

        if (key in hash) {
          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
          hash[key].push(value);
        }
        else hash[key] = value;
      }
      return hash;
    });
  },

  toArray: function() {
    return this.split('');
  },

  succ: function() {
    return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  },

  times: function(count) {
    return count < 1 ? '' : new Array(count + 1).join(this);
  },

  camelize: function() {
    var parts = this.split('-'), len = parts.length;
    if (len == 1) return parts[0];

    var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

    for (var i = 1; i < len; i++)
      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

    return camelized;
  },

  capitalize: function() {
    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  },

  underscore: function() {
    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
  },

  dasherize: function() {
    return this.gsub(/_/,'-');
  },

  inspect: function(useDoubleQuotes) {
    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
      var character = String.specialChar[match[0]];
      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    });
    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  },

  toJSON: function() {
    return this.inspect(true);
  },

  unfilterJSON: function(filter) {
    return this.sub(filter || Prototype.JSONFilter, '#{1}');
  },

  isJSON: function() {
    var str = this;
    if (str.blank()) return false;
    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  },

  evalJSON: function(sanitize) {
    var json = this.unfilterJSON();
    try {
      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    } catch (e) { }
    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  },

  include: function(pattern) {
    return this.indexOf(pattern) > -1;
  },

  startsWith: function(pattern) {
    return this.indexOf(pattern) === 0;
  },

  endsWith: function(pattern) {
    var d = this.length - pattern.length;
    return d >= 0 && this.lastIndexOf(pattern) === d;
  },

  empty: function() {
    return this == '';
  },

  blank: function() {
    return /^\s*$/.test(this);
  },

  interpolate: function(object, pattern) {
    return new Template(this, pattern).evaluate(object);
  }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  escapeHTML: function() {
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  },
  unescapeHTML: function() {
    return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
  if (Object.isFunction(replacement)) return replacement;
  var template = new Template(replacement);
  return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
  div:  document.createElement('div'),
  text: document.createTextNode('')
});

String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);

var Template = Class.create({
  initialize: function(template, pattern) {
    this.template = template.toString();
    this.pattern = pattern || Template.Pattern;
  },

  evaluate: function(object) {
    if (Object.isFunction(object.toTemplateReplacements))
      object = object.toTemplateReplacements();

    return this.template.gsub(this.pattern, function(match) {
      if (object == null) return '';

      var before = match[1] || '';
      if (before == '\\') return match[2];

      var ctx = object, expr = match[3];
      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
      match = pattern.exec(expr);
      if (match == null) return before;

      while (match != null) {
        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
        ctx = ctx[comp];
        if (null == ctx || '' == match[3]) break;
        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
        match = pattern.exec(expr);
      }

      return before + String.interpret(ctx);
    });
  }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
  each: function(iterator, context) {
    var index = 0;
    try {
      this._each(function(value) {
        iterator.call(context, value, index++);
      });
    } catch (e) {
      if (e != $break) throw e;
    }
    return this;
  },

  eachSlice: function(number, iterator, context) {
    var index = -number, slices = [], array = this.toArray();
    if (number < 1) return array;
    while ((index += number) < array.length)
      slices.push(array.slice(index, index+number));
    return slices.collect(iterator, context);
  },

  all: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = true;
    this.each(function(value, index) {
      result = result && !!iterator.call(context, value, index);
      if (!result) throw $break;
    });
    return result;
  },

  any: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = false;
    this.each(function(value, index) {
      if (result = !!iterator.call(context, value, index))
        throw $break;
    });
    return result;
  },

  collect: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];
    this.each(function(value, index) {
      results.push(iterator.call(context, value, index));
    });
    return results;
  },

  detect: function(iterator, context) {
    var result;
    this.each(function(value, index) {
      if (iterator.call(context, value, index)) {
        result = value;
        throw $break;
      }
    });
    return result;
  },

  findAll: function(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (iterator.call(context, value, index))
        results.push(value);
    });
    return results;
  },

  grep: function(filter, iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];

    if (Object.isString(filter))
      filter = new RegExp(filter);

    this.each(function(value, index) {
      if (filter.match(value))
        results.push(iterator.call(context, value, index));
    });
    return results;
  },

  include: function(object) {
    if (Object.isFunction(this.indexOf))
      if (this.indexOf(object) != -1) return true;

    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
  },

  inGroupsOf: function(number, fillWith) {
    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length < number) slice.push(fillWith);
      return slice;
    });
  },

  inject: function(memo, iterator, context) {
    this.each(function(value, index) {
      memo = iterator.call(context, memo, value, index);
    });
    return memo;
  },

  invoke: function(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
  },

  max: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index);
      if (result == null || value >= result)
        result = value;
    });
    return result;
  },

  min: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index);
      if (result == null || value < result)
        result = value;
    });
    return result;
  },

  partition: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var trues = [], falses = [];
    this.each(function(value, index) {
      (iterator.call(context, value, index) ?
        trues : falses).push(value);
    });
    return [trues, falses];
  },

  pluck: function(property) {
    var results = [];
    this.each(function(value) {
      results.push(value[property]);
    });
    return results;
  },

  reject: function(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (!iterator.call(context, value, index))
        results.push(value);
    });
    return results;
  },

  sortBy: function(iterator, context) {
    return this.map(function(value, index) {
      return {
        value: value,
        criteria: iterator.call(context, value, index)
      };
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }).pluck('value');
  },

  toArray: function() {
    return this.map();
  },

  zip: function() {
    var iterator = Prototype.K, args = $A(arguments);
    if (Object.isFunction(args.last()))
      iterator = args.pop();

    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
  },

  size: function() {
    return this.toArray().length;
  },

  inspect: function() {
    return '#<Enumerable:' + this.toArray().inspect() + '>';
  }
};

Object.extend(Enumerable, {
  map:     Enumerable.collect,
  find:    Enumerable.detect,
  select:  Enumerable.findAll,
  filter:  Enumerable.findAll,
  member:  Enumerable.include,
  entries: Enumerable.toArray,
  every:   Enumerable.all,
  some:    Enumerable.any
});
function $A(iterable) {
  if (!iterable) return [];
  if (iterable.toArray) return iterable.toArray();
  var length = iterable.length || 0, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
}

if (Prototype.Browser.WebKit) {
  $A = function(iterable) {
    if (!iterable) return [];
    // In Safari, only use the `toArray` method if it's not a NodeList.
    // A NodeList is a function, has an function `item` property, and a numeric
    // `length` property. Adapted from Google Doctype.
    if (!(typeof iterable === 'function' && typeof iterable.length ===
        'number' && typeof iterable.item === 'function') && iterable.toArray)
      return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  _each: function(iterator) {
    for (var i = 0, length = this.length; i < length; i++)
      iterator(this[i]);
  },

  clear: function() {
    this.length = 0;
    return this;
  },

  first: function() {
    return this[0];
  },

  last: function() {
    return this[this.length - 1];
  },

  compact: function() {
    return this.select(function(value) {
      return value != null;
    });
  },

  flatten: function() {
    return this.inject([], function(array, value) {
      return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
    });
  },

  without: function() {
    var values = $A(arguments);
    return this.select(function(value) {
      return !values.include(value);
    });
  },

  reverse: function(inline) {
    return (inline !== false ? this : this.toArray())._reverse();
  },

  reduce: function() {
    return this.length > 1 ? this : this[0];
  },

  uniq: function(sorted) {
    return this.inject([], function(array, value, index) {
      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
        array.push(value);
      return array;
    });
  },

  intersect: function(array) {
    return this.uniq().findAll(function(item) {
      return array.detect(function(value) { return item === value });
    });
  },

  clone: function() {
    return [].concat(this);
  },

  size: function() {
    return this.length;
  },

  inspect: function() {
    return '[' + this.map(Object.inspect).join(', ') + ']';
  },

  toJSON: function() {
    var results = [];
    this.each(function(object) {
      var value = Object.toJSON(object);
      if (!Object.isUndefined(value)) results.push(value);
    });
    return '[' + results.join(', ') + ']';
  }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
  Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
  i || (i = 0);
  var length = this.length;
  if (i < 0) i = length + i;
  for (; i < length; i++)
    if (this[i] === item) return i;
  return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
  var n = this.slice(0, i).reverse().indexOf(item);
  return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
  if (!Object.isString(string)) return [];
  string = string.strip();
  return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
  Array.prototype.concat = function() {
    var array = [];
    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    for (var i = 0, length = arguments.length; i < length; i++) {
      if (Object.isArray(arguments[i])) {
        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          array.push(arguments[i][j]);
      } else {
        array.push(arguments[i]);
      }
    }
    return array;
  };
}
Object.extend(Number.prototype, {
  toColorPart: function() {
    return this.toPaddedString(2, 16);
  },

  succ: function() {
    return this + 1;
  },

  times: function(iterator, context) {
    $R(0, this, true).each(iterator, context);
    return this;
  },

  toPaddedString: function(length, radix) {
    var string = this.toString(radix || 10);
    return '0'.times(length - string.length) + string;
  },

  toJSON: function() {
    return isFinite(this) ? this.toString() : 'null';
  }
});

$w('abs round ceil floor').each(function(method){
  Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
  return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

  function toQueryPair(key, value) {
    if (Object.isUndefined(value)) return key;
    return key + '=' + encodeURIComponent(String.interpret(value));
  }

  return {
    initialize: function(object) {
      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    },

    _each: function(iterator) {
      for (var key in this._object) {
        var value = this._object[key], pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator(pair);
      }
    },

    set: function(key, value) {
      return this._object[key] = value;
    },

    get: function(key) {
      // simulating poorly supported hasOwnProperty
      if (this._object[key] !== Object.prototype[key])
        return this._object[key];
    },

    unset: function(key) {
      var value = this._object[key];
      delete this._object[key];
      return value;
    },

    toObject: function() {
      return Object.clone(this._object);
    },

    keys: function() {
      return this.pluck('key');
    },

    values: function() {
      return this.pluck('value');
    },

    index: function(value) {
      var match = this.detect(function(pair) {
        return pair.value === value;
      });
      return match && match.key;
    },

    merge: function(object) {
      return this.clone().update(object);
    },

    update: function(object) {
      return new Hash(object).inject(this, function(result, pair) {
        result.set(pair.key, pair.value);
        return result;
      });
    },

    toQueryString: function() {
      return this.inject([], function(results, pair) {
        var key = encodeURIComponent(pair.key), values = pair.value;

        if (values && typeof values == 'object') {
          if (Object.isArray(values))
            return results.concat(values.map(toQueryPair.curry(key)));
        } else results.push(toQueryPair(key, values));
        return results;
      }).join('&');
    },

    inspect: function() {
      return '#<Hash:{' + this.map(function(pair) {
        return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
    },

    toJSON: function() {
      return Object.toJSON(this.toObject());
    },

    clone: function() {
      return new Hash(this);
    }
  }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
  initialize: function(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
  },

  _each: function(iterator) {
    var value = this.start;
    while (this.include(value)) {
      iterator(value);
      value = value.succ();
    }
  },

  include: function(value) {
    if (value < this.start)
      return false;
    if (this.exclusive)
      return value < this.end;
    return value <= this.end;
  }
});

var $R = function(start, end, exclusive) {
  return new ObjectRange(start, end, exclusive);
};

var Ajax = {
  getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
  },

  activeRequestCount: 0
};

Ajax.Responders = {
  responders: [],

  _each: function(iterator) {
    this.responders._each(iterator);
  },

  register: function(responder) {
    if (!this.include(responder))
      this.responders.push(responder);
  },

  unregister: function(responder) {
    this.responders = this.responders.without(responder);
  },

  dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (Object.isFunction(responder[callback])) {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) { }
      }
    });
  }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
  onCreate:   function() { Ajax.activeRequestCount++ },
  onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
  initialize: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType:  'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   '',
      evalJSON:     true,
      evalJS:       true
    };
    Object.extend(this.options, options || { });

    this.options.method = this.options.method.toLowerCase();

    if (Object.isString(this.options.parameters))
      this.options.parameters = this.options.parameters.toQueryParams();
    else if (Object.isHash(this.options.parameters))
      this.options.parameters = this.options.parameters.toObject();
  }
});

Ajax.Request = Class.create(Ajax.Base, {
  _complete: false,

  initialize: function($super, url, options) {
    $super(options);
    this.transport = Ajax.getTransport();
    this.request(url);
  },

  request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = Object.clone(this.options.parameters);

    if (!['get', 'post'].include(this.method)) {
      // simulate other verbs over post
      params['_method'] = this.method;
      this.method = 'post';
    }

    this.parameters = params;

    if (params = Object.toQueryString(params)) {
      // when GET, append parameters to URL
      if (this.method == 'get')
        this.url += (this.url.include('?') ? '&' : '?') + params;
      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
        params += '&_=';
    }

    try {
      var response = new Ajax.Response(this);
      if (this.options.onCreate) this.options.onCreate(response);
      Ajax.Responders.dispatch('onCreate', this, response);

      this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

      this.transport.onreadystatechange = this.onStateChange.bind(this);
      this.setRequestHeaders();

      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
      this.transport.send(this.body);

      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();

    }
    catch (e) {
      this.dispatchException(e);
    }
  },

  onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
  },

  setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };

    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
            headers['Connection'] = 'close';
    }

    // user-defined headers
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;

      if (Object.isFunction(extras.push))
        for (var i = 0, length = extras.length; i < length; i += 2)
          headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }

    for (var name in headers)
      this.transport.setRequestHeader(name, headers[name]);
  },

  success: function() {
    var status = this.getStatus();
    return !status || (status >= 200 && status < 300);
  },

  getStatus: function() {
    try {
      return this.transport.status || 0;
    } catch (e) { return 0 }
  },

  respondToReadyState: function(readyState) {
    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }

      var contentType = response.getHeader('Content-type');
      if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
        this.evalResponse();
    }

    try {
      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }

    if (state == 'Complete') {
      // avoid memory leak in MSIE: clean up
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
  },

  isSameOrigin: function() {
    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
      protocol: location.protocol,
      domain: document.domain,
      port: location.port ? ':' + location.port : ''
    }));
  },

  getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name) || null;
    } catch (e) { return null }
  },

  evalResponse: function() {
    try {
      return eval((this.transport.responseText || '').unfilterJSON());
    } catch (e) {
      this.dispatchException(e);
    }
  },

  dispatchException: function(exception) {
    (this.options.onException || Prototype.emptyFunction)(this, exception);
    Ajax.Responders.dispatch('onException', this, exception);
  }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
  initialize: function(request){
    this.request = request;
    var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;

    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
      this.status       = this.getStatus();
      this.statusText   = this.getStatusText();
      this.responseText = String.interpret(transport.responseText);
      this.headerJSON   = this._getHeaderJSON();
    }

    if(readyState == 4) {
      var xml = transport.responseXML;
      this.responseXML  = Object.isUndefined(xml) ? null : xml;
      this.responseJSON = this._getResponseJSON();
    }
  },

  status:      0,
  statusText: '',

  getStatus: Ajax.Request.prototype.getStatus,

  getStatusText: function() {
    try {
      return this.transport.statusText || '';
    } catch (e) { return '' }
  },

  getHeader: Ajax.Request.prototype.getHeader,

  getAllHeaders: function() {
    try {
      return this.getAllResponseHeaders();
    } catch (e) { return null }
  },

  getResponseHeader: function(name) {
    return this.transport.getResponseHeader(name);
  },

  getAllResponseHeaders: function() {
    return this.transport.getAllResponseHeaders();
  },

  _getHeaderJSON: function() {
    var json = this.getHeader('X-JSON');
    if (!json) return null;
    json = decodeURIComponent(escape(json));
    try {
      return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  },

  _getResponseJSON: function() {
    var options = this.request.options;
    if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
          return null;
    try {
      return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  }
});

Ajax.Updater = Class.create(Ajax.Request, {
  initialize: function($super, container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    };

    options = Object.clone(options);
    var onComplete = options.onComplete;
    options.onComplete = (function(response, json) {
      this.updateContent(response.responseText);
      if (Object.isFunction(onComplete)) onComplete(response, json);
    }).bind(this);

    $super(url, options);
  },

  updateContent: function(responseText) {
    var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

    if (!options.evalScripts) responseText = responseText.stripScripts();

    if (receiver = $(receiver)) {
      if (options.insertion) {
        if (Object.isString(options.insertion)) {
          var insertion = { }; insertion[options.insertion] = responseText;
          receiver.insert(insertion);
        }
        else options.insertion(receiver, responseText);
      }
      else receiver.update(responseText);
    }
  }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  initialize: function($super, container, url, options) {
    $super(options);
    this.onComplete = this.options.onComplete;

    this.frequency = (this.options.frequency || 2);
    this.decay = (this.options.decay || 1);

    this.updater = { };
    this.container = container;
    this.url = url;

    this.start();
  },

  start: function() {
    this.options.onComplete = this.updateComplete.bind(this);
    this.onTimerEvent();
  },

  stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },

  updateComplete: function(response) {
    if (this.options.decay) {
      this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

      this.lastText = response.responseText;
    }
    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  },

  onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (Object.isString(element))
    element = document.getElementById(element);
  return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
  document._getElementsByXPath = function(expression, parentElement) {
    var results = [];
    var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, length = query.snapshotLength; i < length; i++)
      results.push(Element.extend(query.snapshotItem(i)));
    return results;
  };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
  // DOM level 2 ECMAScript Language Binding
  Object.extend(Node, {
    ELEMENT_NODE: 1,
    ATTRIBUTE_NODE: 2,
    TEXT_NODE: 3,
    CDATA_SECTION_NODE: 4,
    ENTITY_REFERENCE_NODE: 5,
    ENTITY_NODE: 6,
    PROCESSING_INSTRUCTION_NODE: 7,
    COMMENT_NODE: 8,
    DOCUMENT_NODE: 9,
    DOCUMENT_TYPE_NODE: 10,
    DOCUMENT_FRAGMENT_NODE: 11,
    NOTATION_NODE: 12
  });
}

(function() {
  var element = this.Element;
  this.Element = function(tagName, attributes) {
    attributes = attributes || { };
    tagName = tagName.toLowerCase();
    var cache = Element.cache;
    if (Prototype.Browser.IE && attributes.name) {
      tagName = '<' + tagName + ' name="' + attributes.name + '">';
      delete attributes.name;
      return Element.writeAttribute(document.createElement(tagName), attributes);
    }
    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  };
  Object.extend(this.Element, element || { });
  if (element) this.Element.prototype = element.prototype;
}).call(window);

Element.cache = { };

Element.Methods = {
  visible: function(element) {
    return $(element).style.display != 'none';
  },

  toggle: function(element) {
    element = $(element);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
    return element;
  },

  hide: function(element) {
    element = $(element);
    element.style.display = 'none';
    return element;
  },

  show: function(element) {
    element = $(element);
    element.style.display = '';
    return element;
  },

  remove: function(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
  },

  update: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);
    content = Object.toHTML(content);
    element.innerHTML = content.stripScripts();
    content.evalScripts.bind(content).defer();
    return element;
  },

  replace: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    else if (!Object.isElement(content)) {
      content = Object.toHTML(content);
      var range = element.ownerDocument.createRange();
      range.selectNode(element);
      content.evalScripts.bind(content).defer();
      content = range.createContextualFragment(content.stripScripts());
    }
    element.parentNode.replaceChild(content, element);
    return element;
  },

  insert: function(element, insertions) {
    element = $(element);

    if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
          insertions = {bottom:insertions};

    var content, insert, tagName, childNodes;

    for (var position in insertions) {
      content  = insertions[position];
      position = position.toLowerCase();
      insert = Element._insertionTranslations[position];

      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        insert(element, content);
        continue;
      }

      content = Object.toHTML(content);

      tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

      if (position == 'top' || position == 'after') childNodes.reverse();
      childNodes.each(insert.curry(element));

      content.evalScripts.bind(content).defer();
    }

    return element;
  },

  wrap: function(element, wrapper, attributes) {
    element = $(element);
    if (Object.isElement(wrapper))
      $(wrapper).writeAttribute(attributes || { });
    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
    else wrapper = new Element('div', wrapper);
    if (element.parentNode)
      element.parentNode.replaceChild(wrapper, element);
    wrapper.appendChild(element);
    return wrapper;
  },

  inspect: function(element) {
    element = $(element);
    var result = '<' + element.tagName.toLowerCase();
    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
      var property = pair.first(), attribute = pair.last();
      var value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
  },

  recursivelyCollect: function(element, property) {
    element = $(element);
    var elements = [];
    while (element = element[property])
      if (element.nodeType == 1)
        elements.push(Element.extend(element));
    return elements;
  },

  ancestors: function(element) {
    return $(element).recursivelyCollect('parentNode');
  },

  descendants: function(element) {
    return $(element).select("*");
  },

  firstDescendant: function(element) {
    element = $(element).firstChild;
    while (element && element.nodeType != 1) element = element.nextSibling;
    return $(element);
  },

  immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
  },

  previousSiblings: function(element) {
    return $(element).recursivelyCollect('previousSibling');
  },

  nextSiblings: function(element) {
    return $(element).recursivelyCollect('nextSibling');
  },

  siblings: function(element) {
    element = $(element);
    return element.previousSiblings().reverse().concat(element.nextSiblings());
  },

  match: function(element, selector) {
    if (Object.isString(selector))
      selector = new Selector(selector);
    return selector.match($(element));
  },

  up: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(element.parentNode);
    var ancestors = element.ancestors();
    return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
  },

  down: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return element.firstDescendant();
    return Object.isNumber(expression) ? element.descendants()[expression] :
      Element.select(element, expression)[index || 0];
  },

  previous: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
    var previousSiblings = element.previousSiblings();
    return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
  },

  next: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
    var nextSiblings = element.nextSiblings();
    return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
  },

  select: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element, args);
  },

  adjacent: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element.parentNode, args).without(element);
  },

  identify: function(element) {
    element = $(element);
    var id = element.readAttribute('id'), self = arguments.callee;
    if (id) return id;
    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
    element.writeAttribute('id', id);
    return id;
  },

  readAttribute: function(element, name) {
    element = $(element);
    if (Prototype.Browser.IE) {
      var t = Element._attributeTranslations.read;
      if (t.values[name]) return t.values[name](element, name);
      if (t.names[name]) name = t.names[name];
      if (name.include(':')) {
        return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
      }
    }
    return element.getAttribute(name);
  },

  writeAttribute: function(element, name, value) {
    element = $(element);
    var attributes = { }, t = Element._attributeTranslations.write;

    if (typeof name == 'object') attributes = name;
    else attributes[name] = Object.isUndefined(value) ? true : value;

    for (var attr in attributes) {
      name = t.names[attr] || attr;
      value = attributes[attr];
      if (t.values[attr]) name = t.values[attr](element, value);
      if (value === false || value === null)
        element.removeAttribute(name);
      else if (value === true)
        element.setAttribute(name, name);
      else element.setAttribute(name, value);
    }
    return element;
  },

  getHeight: function(element) {
    return $(element).getDimensions().height;
  },

  getWidth: function(element) {
    return $(element).getDimensions().width;
  },

  classNames: function(element) {
    return new Element.ClassNames(element);
  },

  hasClassName: function(element, className) {
    if (!(element = $(element))) return;
    var elementClassName = element.className;
    return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
  },

  addClassName: function(element, className) {
    if (!(element = $(element))) return;
    if (!element.hasClassName(className))
      element.className += (element.className ? ' ' : '') + className;
    return element;
  },

  removeClassName: function(element, className) {
    if (!(element = $(element))) return;
    element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
    return element;
  },

  toggleClassName: function(element, className) {
    if (!(element = $(element))) return;
    return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
  },

  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
    element = $(element);
    var node = element.firstChild;
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
  },

  empty: function(element) {
    return $(element).innerHTML.blank();
  },

  descendantOf: function(element, ancestor) {
    element = $(element), ancestor = $(ancestor);

    if (element.compareDocumentPosition)
      return (element.compareDocumentPosition(ancestor) & 8) === 8;

    if (ancestor.contains)
      return ancestor.contains(element) && ancestor !== element;

    while (element = element.parentNode)
      if (element == ancestor) return true;

    return false;
  },

  scrollTo: function(element) {
    element = $(element);
    var pos = element.cumulativeOffset();
    window.scrollTo(pos[0], pos[1]);
    return element;
  },

  getStyle: function(element, style) {
    element = $(element);
    style = style == 'float' ? 'cssFloat' : style.camelize();
    var value = element.style[style];
    if (!value || value == 'auto') {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
    return value == 'auto' ? null : value;
  },

  getOpacity: function(element) {
    return $(element).getStyle('opacity');
  },

  setStyle: function(element, styles) {
    element = $(element);
    var elementStyle = element.style, match;
    if (Object.isString(styles)) {
      element.style.cssText += ';' + styles;
      return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
    }
    for (var property in styles)
      if (property == 'opacity') element.setOpacity(styles[property]);
      else
        elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

    return element;
  },

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
    return element;
  },

  getDimensions: function(element) {
    element = $(element);
    var display = element.getStyle('display');
    if (display != 'none' && display != null) // Safari bug
      return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
  },

  makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      element._madePositioned = true;
      element.style.position = 'relative';
      // Opera returns the offset relative to the positioning context, when an
      // element is position relative but top and left have not been defined
      if (Prototype.Browser.Opera) {
        element.style.top = 0;
        element.style.left = 0;
      }
    }
    return element;
  },

  undoPositioned: function(element) {
    element = $(element);
    if (element._madePositioned) {
      element._madePositioned = undefined;
      element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
    }
    return element;
  },

  makeClipping: function(element) {
    element = $(element);
    if (element._overflow) return element;
    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
    if (element._overflow !== 'hidden')
      element.style.overflow = 'hidden';
    return element;
  },

  undoClipping: function(element) {
    element = $(element);
    if (!element._overflow) return element;
    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
    element._overflow = null;
    return element;
  },

  cumulativeOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  positionedOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
      if (element) {
        if (element.tagName.toUpperCase() == 'BODY') break;
        var p = Element.getStyle(element, 'position');
        if (p !== 'static') break;
      }
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  absolutize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'absolute') return element;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    var offsets = element.positionedOffset();
    var top     = offsets[1];
    var left    = offsets[0];
    var width   = element.clientWidth;
    var height  = element.clientHeight;

    element._originalLeft   = left - parseFloat(element.style.left  || 0);
    element._originalTop    = top  - parseFloat(element.style.top || 0);
    element._originalWidth  = element.style.width;
    element._originalHeight = element.style.height;

    element.style.position = 'absolute';
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.width  = width + 'px';
    element.style.height = height + 'px';
    return element;
  },

  relativize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'relative') return element;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    element.style.position = 'relative';
    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.height = element._originalHeight;
    element.style.width  = element._originalWidth;
    return element;
  },

  cumulativeScrollOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.scrollTop  || 0;
      valueL += element.scrollLeft || 0;
      element = element.parentNode;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  getOffsetParent: function(element) {
    if (element.offsetParent) return $(element.offsetParent);
    if (element == document.body) return $(element);

    while ((element = element.parentNode) && element != document.body)
      if (Element.getStyle(element, 'position') != 'static')
        return $(element);

    return $(document.body);
  },

  viewportOffset: function(forElement) {
    var valueT = 0, valueL = 0;

    var element = forElement;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;

      // Safari fix
      if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

    } while (element = element.offsetParent);

    element = forElement;
    do {
      if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
        valueT -= element.scrollTop  || 0;
        valueL -= element.scrollLeft || 0;
      }
    } while (element = element.parentNode);

    return Element._returnOffset(valueL, valueT);
  },

  clonePosition: function(element, source) {
    var options = Object.extend({
      setLeft:    true,
      setTop:     true,
      setWidth:   true,
      setHeight:  true,
      offsetTop:  0,
      offsetLeft: 0
    }, arguments[2] || { });

    // find page position of source
    source = $(source);
    var p = source.viewportOffset();

    // find coordinate system to use
    element = $(element);
    var delta = [0, 0];
    var parent = null;
    // delta [0,0] will do fine with position: fixed elements,
    // position:absolute needs offsetParent deltas
    if (Element.getStyle(element, 'position') == 'absolute') {
      parent = element.getOffsetParent();
      delta = parent.viewportOffset();
    }

    // correct by body offsets (fixes Safari)
    if (parent == document.body) {
      delta[0] -= document.body.offsetLeft;
      delta[1] -= document.body.offsetTop;
    }

    // set position
    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
    return element;
  }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
  getElementsBySelector: Element.Methods.select,
  childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
  write: {
    names: {
      className: 'class',
      htmlFor:   'for'
    },
    values: { }
  }
};

if (Prototype.Browser.Opera) {
  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
      switch (style) {
        case 'left': case 'top': case 'right': case 'bottom':
          if (proceed(element, 'position') === 'static') return null;
        case 'height': case 'width':
          // returns '0px' for hidden elements; we want it to return null
          if (!Element.visible(element)) return null;

          // returns the border-box dimensions rather than the content-box
          // dimensions, so we subtract padding and borders from the value
          var dim = parseInt(proceed(element, style), 10);

          if (dim !== element['offset' + style.capitalize()])
            return dim + 'px';

          var properties;
          if (style === 'height') {
            properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
          }
          else {
            properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
          }
          return properties.inject(dim, function(memo, property) {
            var val = proceed(element, property);
            return val === null ? memo : memo - parseInt(val, 10);
          }) + 'px';
        default: return proceed(element, style);
      }
    }
  );

  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
      if (attribute === 'title') return element.title;
      return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
  // IE doesn't report offsets correctly for static elements, so we change them
  // to "relative" to get the values, then change them back.
  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
      element = $(element);
      // IE throws an error if element is not in document
      try { element.offsetParent }
      catch(e) { return $(document.body) }
      var position = element.getStyle('position');
      if (position !== 'static') return proceed(element);
      element.setStyle({ position: 'relative' });
      var value = proceed(element);
      element.setStyle({ position: position });
      return value;
    }
  );

  $w('positionedOffset viewportOffset').each(function(method) {
    Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
        element = $(element);
        try { element.offsetParent }
        catch(e) { return Element._returnOffset(0,0) }
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
        // Trigger hasLayout on the offset parent so that IE6 reports
        // accurate offsetTop and offsetLeft values for position: fixed.
        var offsetParent = element.getOffsetParent();
        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          offsetParent.setStyle({ zoom: 1 });
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      }
    );
  });

  Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
    function(proceed, element) {
      try { element.offsetParent }
      catch(e) { return Element._returnOffset(0,0) }
      return proceed(element);
    }
  );

  Element.Methods.getStyle = function(element, style) {
    element = $(element);
    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
    var value = element.style[style];
    if (!value && element.currentStyle) value = element.currentStyle[style];

    if (style == 'opacity') {
      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
        if (value[1]) return parseFloat(value[1]) / 100;
      return 1.0;
    }

    if (value == 'auto') {
      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
        return element['offset' + style.capitalize()] + 'px';
      return null;
    }
    return value;
  };

  Element.Methods.setOpacity = function(element, value) {
    function stripAlpha(filter){
      return filter.replace(/alpha\([^\)]*\)/gi,'');
    }
    element = $(element);
    var currentStyle = element.currentStyle;
    if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
        element.style.zoom = 1;

    var filter = element.getStyle('filter'), style = element.style;
    if (value == 1 || value === '') {
      (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
      return element;
    } else if (value < 0.00001) value = 0;
    style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
    return element;
  };

  Element._attributeTranslations = {
    read: {
      names: {
        'class': 'className',
        'for':   'htmlFor'
      },
      values: {
        _getAttr: function(element, attribute) {
          return element.getAttribute(attribute, 2);
        },
        _getAttrNode: function(element, attribute) {
          var node = element.getAttributeNode(attribute);
          return node ? node.value : "";
        },
        _getEv: function(element, attribute) {
          attribute = element.getAttribute(attribute);
          return attribute ? attribute.toString().slice(23, -2) : null;
        },
        _flag: function(element, attribute) {
          return $(element).hasAttribute(attribute) ? attribute : null;
        },
        style: function(element) {
          return element.style.cssText.toLowerCase();
        },
        title: function(element) {
          return element.title;
        }
      }
    }
  };

  Element._attributeTranslations.write = {
    names: Object.extend({
      cellpadding: 'cellPadding',
      cellspacing: 'cellSpacing'
    }, Element._attributeTranslations.read.names),
    values: {
      checked: function(element, value) {
        element.checked = !!value;
      },

      style: function(element, value) {
        element.style.cssText = value ? value : '';
      }
    }
  };

  Element._attributeTranslations.has = {};

  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
  });

  (function(v) {
    Object.extend(v, {
      href:        v._getAttr,
      src:         v._getAttr,
      type:        v._getAttr,
      action:      v._getAttrNode,
      disabled:    v._flag,
      checked:     v._flag,
      readonly:    v._flag,
      multiple:    v._flag,
      onload:      v._getEv,
      onunload:    v._getEv,
      onclick:     v._getEv,
      ondblclick:  v._getEv,
      onmousedown: v._getEv,
      onmouseup:   v._getEv,
      onmouseover: v._getEv,
      onmousemove: v._getEv,
      onmouseout:  v._getEv,
      onfocus:     v._getEv,
      onblur:      v._getEv,
      onkeypress:  v._getEv,
      onkeydown:   v._getEv,
      onkeyup:     v._getEv,
      onsubmit:    v._getEv,
      onreset:     v._getEv,
      onselect:    v._getEv,
      onchange:    v._getEv
    });
  })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
    return element;
  };
}

else if (Prototype.Browser.WebKit) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

    if (value == 1)
      if(element.tagName.toUpperCase() == 'IMG' && element.width) {
        element.width++; element.width--;
      } else try {
        var n = document.createTextNode(' ');
        element.appendChild(n);
        element.removeChild(n);
      } catch (e) { }

    return element;
  };

  // Safari returns margins on body which is incorrect if the child is absolutely
  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  // KHTML/WebKit only.
  Element.Methods.cumulativeOffset = function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == document.body)
        if (Element.getStyle(element, 'position') == 'absolute') break;

      element = element.offsetParent;
    } while (element);

    return Element._returnOffset(valueL, valueT);
  };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  Element.Methods.update = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);

    content = Object.toHTML(content);
    var tagName = element.tagName.toUpperCase();

    if (tagName in Element._insertionTranslations.tags) {
      $A(element.childNodes).each(function(node) { element.removeChild(node) });
      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
    }
    else element.innerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

if ('outerHTML' in document.createElement('div')) {
  Element.Methods.replace = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      element.parentNode.replaceChild(content, element);
      return element;
    }

    content = Object.toHTML(content);
    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

    if (Element._insertionTranslations.tags[tagName]) {
      var nextSibling = element.next();
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      parent.removeChild(element);
      if (nextSibling)
        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
      else
        fragments.each(function(node) { parent.appendChild(node) });
    }
    else element.outerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

Element._returnOffset = function(l, t) {
  var result = [l, t];
  result.left = l;
  result.top = t;
  return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  if (t) {
    div.innerHTML = t[0] + html + t[1];
    t[2].times(function() { div = div.firstChild });
  } else div.innerHTML = html;
  return $A(div.childNodes);
};

Element._insertionTranslations = {
  before: function(element, node) {
    element.parentNode.insertBefore(node, element);
  },
  top: function(element, node) {
    element.insertBefore(node, element.firstChild);
  },
  bottom: function(element, node) {
    element.appendChild(node);
  },
  after: function(element, node) {
    element.parentNode.insertBefore(node, element.nextSibling);
  },
  tags: {
    TABLE:  ['<table>',                '</table>',                   1],
    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
    SELECT: ['<select>',               '</select>',                  1]
  }
};

(function() {
  Object.extend(this.tags, {
    THEAD: this.tags.TBODY,
    TFOOT: this.tags.TBODY,
    TH:    this.tags.TD
  });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
  hasAttribute: function(element, attribute) {
    attribute = Element._attributeTranslations.has[attribute] || attribute;
    var node = $(element).getAttributeNode(attribute);
    return !!(node && node.specified);
  }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div')['__proto__']) {
  window.HTMLElement = { };
  window.HTMLElement.prototype = document.createElement('div')['__proto__'];
  Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
  if (Prototype.BrowserFeatures.SpecificElementExtensions)
    return Prototype.K;

  var Methods = { }, ByTag = Element.Methods.ByTag;

  var extend = Object.extend(function(element) {
    if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

    var methods = Object.clone(Methods),
      tagName = element.tagName.toUpperCase(), property, value;

    // extend methods for specific tags
    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

    for (property in methods) {
      value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }

    element._extendedByPrototype = Prototype.emptyFunction;
    return element;

  }, {
    refresh: function() {
      // extend methods for all tags (Safari doesn't need this)
      if (!Prototype.BrowserFeatures.ElementExtensions) {
        Object.extend(Methods, Element.Methods);
        Object.extend(Methods, Element.Methods.Simulated);
      }
    }
  });

  extend.refresh();
  return extend;
})();

Element.hasAttribute = function(element, attribute) {
  if (element.hasAttribute) return element.hasAttribute(attribute);
  return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

  if (!methods) {
    Object.extend(Form, Form.Methods);
    Object.extend(Form.Element, Form.Element.Methods);
    Object.extend(Element.Methods.ByTag, {
      "FORM":     Object.clone(Form.Methods),
      "INPUT":    Object.clone(Form.Element.Methods),
      "SELECT":   Object.clone(Form.Element.Methods),
      "TEXTAREA": Object.clone(Form.Element.Methods)
    });
  }

  if (arguments.length == 2) {
    var tagName = methods;
    methods = arguments[1];
  }

  if (!tagName) Object.extend(Element.Methods, methods || { });
  else {
    if (Object.isArray(tagName)) tagName.each(extend);
    else extend(tagName);
  }

  function extend(tagName) {
    tagName = tagName.toUpperCase();
    if (!Element.Methods.ByTag[tagName])
      Element.Methods.ByTag[tagName] = { };
    Object.extend(Element.Methods.ByTag[tagName], methods);
  }

  function copy(methods, destination, onlyIfAbsent) {
    onlyIfAbsent = onlyIfAbsent || false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }

  function findDOMClass(tagName) {
    var klass;
    var trans = {
      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
    };
    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName.capitalize() + 'Element';
    if (window[klass]) return window[klass];

    window[klass] = { };
    window[klass].prototype = document.createElement(tagName)['__proto__'];
    return window[klass];
  }

  if (F.ElementExtensions) {
    copy(Element.Methods, HTMLElement.prototype);
    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
  }

  if (F.SpecificElementExtensions) {
    for (var tag in Element.Methods.ByTag) {
      var klass = findDOMClass(tag);
      if (Object.isUndefined(klass)) continue;
      copy(T[tag], klass.prototype);
    }
  }

  Object.extend(Element, Element.Methods);
  delete Element.ByTag;

  if (Element.extend.refresh) Element.extend.refresh();
  Element.cache = { };
};

document.viewport = {
  getDimensions: function() {
    var dimensions = { }, B = Prototype.Browser;
    $w('width height').each(function(d) {
      var D = d.capitalize();
      if (B.WebKit && !document.evaluate) {
        // Safari <3.0 needs self.innerWidth/Height
        dimensions[d] = self['inner' + D];
      } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
        // Opera <9.5 needs document.body.clientWidth/Height
        dimensions[d] = document.body['client' + D]
      } else {
        dimensions[d] = document.documentElement['client' + D];
      }
    });
    return dimensions;
  },

  getWidth: function() {
    return this.getDimensions().width;
  },

  getHeight: function() {
    return this.getDimensions().height;
  },

  getScrollOffsets: function() {
    return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  }
};
/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
 * license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
  initialize: function(expression) {
    this.expression = expression.strip();

    if (this.shouldUseSelectorsAPI()) {
      this.mode = 'selectorsAPI';
    } else if (this.shouldUseXPath()) {
      this.mode = 'xpath';
      this.compileXPathMatcher();
    } else {
      this.mode = "normal";
      this.compileMatcher();
    }

  },

  shouldUseXPath: function() {
    if (!Prototype.BrowserFeatures.XPath) return false;

    var e = this.expression;

    // Safari 3 chokes on :*-of-type and :empty
    if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
      return false;

    // XPath can't do namespaced attributes, nor can it read
    // the "checked" property from DOM nodes
    if ((/(\[[\w-]*?:|:checked)/).test(e))
      return false;

    return true;
  },

  shouldUseSelectorsAPI: function() {
    if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

    if (!Selector._div) Selector._div = new Element('div');

    // Make sure the browser treats the selector as valid. Test on an
    // isolated element to minimize cost of this check.
    try {
      Selector._div.querySelector(this.expression);
    } catch(e) {
      return false;
    }

    return true;
  },

  compileMatcher: function() {
    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

    if (Selector._cache[e]) {
      this.matcher = Selector._cache[e];
      return;
    }

    this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
            new Template(c[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.matcher.push("return h.unique(n);\n}");
    eval(this.matcher.join('\n'));
    Selector._cache[this.expression] = this.matcher;
  },

  compileXPathMatcher: function() {
    var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

    if (Selector._cache[e]) {
      this.xpath = Selector._cache[e]; return;
    }

    this.matcher = ['.//*'];
    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        if (m = e.match(ps[i])) {
          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.xpath = this.matcher.join('');
    Selector._cache[this.expression] = this.xpath;
  },

  findElements: function(root) {
    root = root || document;
    var e = this.expression, results;

    switch (this.mode) {
      case 'selectorsAPI':
        // querySelectorAll queries document-wide, then filters to descendants
        // of the context element. That's not what we want.
        // Add an explicit context to the selector if necessary.
        if (root !== document) {
          var oldId = root.id, id = $(root).identify();
          e = "#" + id + " " + e;
        }

        results = $A(root.querySelectorAll(e)).map(Element.extend);
        root.id = oldId;

        return results;
      case 'xpath':
        return document._getElementsByXPath(this.xpath, root);
      default:
       return this.matcher(root);
    }
  },

  match: function(element) {
    this.tokens = [];

    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
    var le, p, m;

    while (e && le !== e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          // use the Selector.assertions methods unless the selector
          // is too complex.
          if (as[i]) {
            this.tokens.push([i, Object.clone(m)]);
            e = e.replace(m[0], '');
          } else {
            // reluctantly do a document-wide search
            // and look for a match in the array
            return this.findElements(document).include(element);
          }
        }
      }
    }

    var match = true, name, matches;
    for (var i = 0, token; token = this.tokens[i]; i++) {
      name = token[0], matches = token[1];
      if (!Selector.assertions[name](element, matches)) {
        match = false; break;
      }
    }

    return match;
  },

  toString: function() {
    return this.expression;
  },

  inspect: function() {
    return "#<Selector:" + this.expression.inspect() + ">";
  }
});

Object.extend(Selector, {
  _cache: { },

  xpath: {
    descendant:   "//*",
    child:        "/*",
    adjacent:     "/following-sibling::*[1]",
    laterSibling: '/following-sibling::*',
    tagName:      function(m) {
      if (m[1] == '*') return '';
      return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
    },
    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
    id:           "[@id='#{1}']",
    attrPresence: function(m) {
      m[1] = m[1].toLowerCase();
      return new Template("[@#{1}]").evaluate(m);
    },
    attr: function(m) {
      m[1] = m[1].toLowerCase();
      m[3] = m[5] || m[6];
      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
    },
    pseudo: function(m) {
      var h = Selector.xpath.pseudos[m[1]];
      if (!h) return '';
      if (Object.isFunction(h)) return h(m);
      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
    },
    operators: {
      '=':  "[@#{1}='#{3}']",
      '!=': "[@#{1}!='#{3}']",
      '^=': "[starts-with(@#{1}, '#{3}')]",
      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
      '*=': "[contains(@#{1}, '#{3}')]",
      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
    },
    pseudos: {
      'first-child': '[not(preceding-sibling::*)]',
      'last-child':  '[not(following-sibling::*)]',
      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
      'empty':       "[count(*) = 0 and (count(text()) = 0)]",
      'checked':     "[@checked]",
      'disabled':    "[(@disabled) and (@type!='hidden')]",
      'enabled':     "[not(@disabled) and (@type!='hidden')]",
      'not': function(m) {
        var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

        var exclusion = [];
        while (e && le != e && (/\S/).test(e)) {
          le = e;
          for (var i in p) {
            if (m = e.match(p[i])) {
              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
              e = e.replace(m[0], '');
              break;
            }
          }
        }
        return "[not(" + exclusion.join(" and ") + ")]";
      },
      'nth-child':      function(m) {
        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
      },
      'nth-last-child': function(m) {
        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
      },
      'nth-of-type':    function(m) {
        return Selector.xpath.pseudos.nth("position() ", m);
      },
      'nth-last-of-type': function(m) {
        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
      },
      'first-of-type':  function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
      },
      'last-of-type':   function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
      },
      'only-of-type':   function(m) {
        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
      },
      nth: function(fragment, m) {
        var mm, formula = m[6], predicate;
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        if (mm = formula.match(/^(\d+)$/)) // digit only
          return '[' + fragment + "= " + mm[1] + ']';
        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          if (mm[1] == "-") mm[1] = -1;
          var a = mm[1] ? Number(mm[1]) : 1;
          var b = mm[2] ? Number(mm[2]) : 0;
          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
          return new Template(predicate).evaluate({
            fragment: fragment, a: a, b: b });
        }
      }
    }
  },

  criteria: {
    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
    attr: function(m) {
      m[3] = (m[5] || m[6]);
      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
    },
    pseudo: function(m) {
      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
    },
    descendant:   'c = "descendant";',
    child:        'c = "child";',
    adjacent:     'c = "adjacent";',
    laterSibling: 'c = "laterSibling";'
  },

  patterns: {
    // combinators must be listed first
    // (and descendant needs to be last combinator)
    laterSibling: /^\s*~\s*/,
    child:        /^\s*>\s*/,
    adjacent:     /^\s*\+\s*/,
    descendant:   /^\s/,

    // selectors follow
    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
    id:           /^#([\w\-\*]+)(\b|$)/,
    className:    /^\.([\w\-\*]+)(\b|$)/,
    pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
    attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  },

  // for Selector.match and Element#match
  assertions: {
    tagName: function(element, matches) {
      return matches[1].toUpperCase() == element.tagName.toUpperCase();
    },

    className: function(element, matches) {
      return Element.hasClassName(element, matches[1]);
    },

    id: function(element, matches) {
      return element.id === matches[1];
    },

    attrPresence: function(element, matches) {
      return Element.hasAttribute(element, matches[1]);
    },

    attr: function(element, matches) {
      var nodeValue = Element.readAttribute(element, matches[1]);
      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
    }
  },

  handlers: {
    // UTILITY FUNCTIONS
    // joins two collections
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        a.push(node);
      return a;
    },

    // marks an array of nodes for counting
    mark: function(nodes) {
      var _true = Prototype.emptyFunction;
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = _true;
      return nodes;
    },

    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = undefined;
      return nodes;
    },

    // mark each child node with its position (for nth calls)
    // "ofType" flag indicates whether we're indexing for nth-of-type
    // rather than nth-child
    index: function(parentNode, reverse, ofType) {
      parentNode._countedByPrototype = Prototype.emptyFunction;
      if (reverse) {
        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
          var node = nodes[i];
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
        }
      } else {
        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
      }
    },

    // filters out duplicates and extends all nodes
    unique: function(nodes) {
      if (nodes.length == 0) return nodes;
      var results = [], n;
      for (var i = 0, l = nodes.length; i < l; i++)
        if (!(n = nodes[i])._countedByPrototype) {
          n._countedByPrototype = Prototype.emptyFunction;
          results.push(Element.extend(n));
        }
      return Selector.handlers.unmark(results);
    },

    // COMBINATOR FUNCTIONS
    descendant: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, node.getElementsByTagName('*'));
      return results;
    },

    child: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        for (var j = 0, child; child = node.childNodes[j]; j++)
          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
      }
      return results;
    },

    adjacent: function(nodes) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        var next = this.nextElementSibling(node);
        if (next) results.push(next);
      }
      return results;
    },

    laterSibling: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, Element.nextSiblings(node));
      return results;
    },

    nextElementSibling: function(node) {
      while (node = node.nextSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    previousElementSibling: function(node) {
      while (node = node.previousSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    // TOKEN FUNCTIONS
    tagName: function(nodes, root, tagName, combinator) {
      var uTagName = tagName.toUpperCase();
      var results = [], h = Selector.handlers;
      if (nodes) {
        if (combinator) {
          // fastlane for ordinary descendant combinators
          if (combinator == "descendant") {
            for (var i = 0, node; node = nodes[i]; i++)
              h.concat(results, node.getElementsByTagName(tagName));
            return results;
          } else nodes = this[combinator](nodes);
          if (tagName == "*") return nodes;
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.tagName.toUpperCase() === uTagName) results.push(node);
        return results;
      } else return root.getElementsByTagName(tagName);
    },

    id: function(nodes, root, id, combinator) {
      var targetNode = $(id), h = Selector.handlers;
      if (!targetNode) return [];
      if (!nodes && root == document) return [targetNode];
      if (nodes) {
        if (combinator) {
          if (combinator == 'child') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (targetNode.parentNode == node) return [targetNode];
          } else if (combinator == 'descendant') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Element.descendantOf(targetNode, node)) return [targetNode];
          } else if (combinator == 'adjacent') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Selector.handlers.previousElementSibling(targetNode) == node)
                return [targetNode];
          } else nodes = h[combinator](nodes);
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node == targetNode) return [targetNode];
        return [];
      }
      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
    },

    className: function(nodes, root, className, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      return Selector.handlers.byClassName(nodes, root, className);
    },

    byClassName: function(nodes, root, className) {
      if (!nodes) nodes = Selector.handlers.descendant([root]);
      var needle = ' ' + className + ' ';
      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
        nodeClassName = node.className;
        if (nodeClassName.length == 0) continue;
        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
          results.push(node);
      }
      return results;
    },

    attrPresence: function(nodes, root, attr, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var results = [];
      for (var i = 0, node; node = nodes[i]; i++)
        if (Element.hasAttribute(node, attr)) results.push(node);
      return results;
    },

    attr: function(nodes, root, attr, value, operator, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var handler = Selector.operators[operator], results = [];
      for (var i = 0, node; node = nodes[i]; i++) {
        var nodeValue = Element.readAttribute(node, attr);
        if (nodeValue === null) continue;
        if (handler(nodeValue, value)) results.push(node);
      }
      return results;
    },

    pseudo: function(nodes, name, value, root, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      if (!nodes) nodes = root.getElementsByTagName("*");
      return Selector.pseudos[name](nodes, value, root);
    }
  },

  pseudos: {
    'first-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.previousElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'last-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.nextElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'only-child': function(nodes, value, root) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
          results.push(node);
      return results;
    },
    'nth-child':        function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root);
    },
    'nth-last-child':   function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true);
    },
    'nth-of-type':      function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, false, true);
    },
    'nth-last-of-type': function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true, true);
    },
    'first-of-type':    function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, false, true);
    },
    'last-of-type':     function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, true, true);
    },
    'only-of-type':     function(nodes, formula, root) {
      var p = Selector.pseudos;
      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
    },

    // handles the an+b logic
    getIndices: function(a, b, total) {
      if (a == 0) return b > 0 ? [b] : [];
      return $R(1, total).inject([], function(memo, i) {
        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
        return memo;
      });
    },

    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
    nth: function(nodes, formula, root, reverse, ofType) {
      if (nodes.length == 0) return [];
      if (formula == 'even') formula = '2n+0';
      if (formula == 'odd')  formula = '2n+1';
      var h = Selector.handlers, results = [], indexed = [], m;
      h.mark(nodes);
      for (var i = 0, node; node = nodes[i]; i++) {
        if (!node.parentNode._countedByPrototype) {
          h.index(node.parentNode, reverse, ofType);
          indexed.push(node.parentNode);
        }
      }
      if (formula.match(/^\d+$/)) { // just a number
        formula = Number(formula);
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.nodeIndex == formula) results.push(node);
      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
        if (m[1] == "-") m[1] = -1;
        var a = m[1] ? Number(m[1]) : 1;
        var b = m[2] ? Number(m[2]) : 0;
        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
          for (var j = 0; j < l; j++)
            if (node.nodeIndex == indices[j]) results.push(node);
        }
      }
      h.unmark(nodes);
      h.unmark(indexed);
      return results;
    },

    'empty': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        // IE treats comments as element nodes
        if (node.tagName == '!' || node.firstChild) continue;
        results.push(node);
      }
      return results;
    },

    'not': function(nodes, selector, root) {
      var h = Selector.handlers, selectorType, m;
      var exclusions = new Selector(selector).findElements(root);
      h.mark(exclusions);
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node._countedByPrototype) results.push(node);
      h.unmark(exclusions);
      return results;
    },

    'enabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node.disabled && (!node.type || node.type !== 'hidden'))
          results.push(node);
      return results;
    },

    'disabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.disabled) results.push(node);
      return results;
    },

    'checked': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.checked) results.push(node);
      return results;
    }
  },

  operators: {
    '=':  function(nv, v) { return nv == v; },
    '!=': function(nv, v) { return nv != v; },
    '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
    '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
    '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
    '$=': function(nv, v) { return nv.endsWith(v); },
    '*=': function(nv, v) { return nv.include(v); },
    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
    '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
     '-').include('-' + (v || "").toUpperCase() + '-'); }
  },

  split: function(expression) {
    var expressions = [];
    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
      expressions.push(m[1].strip());
    });
    return expressions;
  },

  matchElements: function(elements, expression) {
    var matches = $$(expression), h = Selector.handlers;
    h.mark(matches);
    for (var i = 0, results = [], element; element = elements[i]; i++)
      if (element._countedByPrototype) results.push(element);
    h.unmark(matches);
    return results;
  },

  findElement: function(elements, expression, index) {
    if (Object.isNumber(expression)) {
      index = expression; expression = false;
    }
    return Selector.matchElements(elements, expression || '*')[index || 0];
  },

  findChildElements: function(element, expressions) {
    expressions = Selector.split(expressions.join(','));
    var results = [], h = Selector.handlers;
    for (var i = 0, l = expressions.length, selector; i < l; i++) {
      selector = new Selector(expressions[i].strip());
      h.concat(results, selector.findElements(element));
    }
    return (l > 1) ? h.unique(results) : results;
  }
});

if (Prototype.Browser.IE) {
  Object.extend(Selector.handlers, {
    // IE returns comment nodes on getElementsByTagName("*").
    // Filter them out.
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        if (node.tagName !== "!") a.push(node);
      return a;
    },

    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node.removeAttribute('_countedByPrototype');
      return nodes;
    }
  });
}

function $$() {
  return Selector.findChildElements(document, $A(arguments));
}
var Form = {
  reset: function(form) {
    $(form).reset();
    return form;
  },

  serializeElements: function(elements, options) {
    if (typeof options != 'object') options = { hash: !!options };
    else if (Object.isUndefined(options.hash)) options.hash = true;
    var key, value, submitted = false, submit = options.submit;

    var data = elements.inject({ }, function(result, element) {
      if (!element.disabled && element.name) {
        key = element.name; value = $(element).getValue();
        if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
          if (key in result) {
            // a key is already present; construct an array of values
            if (!Object.isArray(result[key])) result[key] = [result[key]];
            result[key].push(value);
          }
          else result[key] = value;
        }
      }
      return result;
    });

    return options.hash ? data : Object.toQueryString(data);
  }
};

Form.Methods = {
  serialize: function(form, options) {
    return Form.serializeElements(Form.getElements(form), options);
  },

  getElements: function(form) {
    return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
        if (Form.Element.Serializers[child.tagName.toLowerCase()])
          elements.push(Element.extend(child));
        return elements;
      }
    );
  },

  getInputs: function(form, typeName, name) {
    form = $(form);
    var inputs = form.getElementsByTagName('input');

    if (!typeName && !name) return $A(inputs).map(Element.extend);

    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
      var input = inputs[i];
      if ((typeName && input.type != typeName) || (name && input.name != name))
        continue;
      matchingInputs.push(Element.extend(input));
    }

    return matchingInputs;
  },

  disable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('disable');
    return form;
  },

  enable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('enable');
    return form;
  },

  findFirstElement: function(form) {
    var elements = $(form).getElements().findAll(function(element) {
      return 'hidden' != element.type && !element.disabled;
    });
    var firstByIndex = elements.findAll(function(element) {
      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
    }).sortBy(function(element) { return element.tabIndex }).first();

    return firstByIndex ? firstByIndex : elements.find(function(element) {
      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
    });
  },

  focusFirstElement: function(form) {
    form = $(form);
    form.findFirstElement().activate();
    return form;
  },

  request: function(form, options) {
    form = $(form), options = Object.clone(options || { });

    var params = options.parameters, action = form.readAttribute('action') || '';
    if (action.blank()) action = window.location.href;
    options.parameters = form.serialize(true);

    if (params) {
      if (Object.isString(params)) params = params.toQueryParams();
      Object.extend(options.parameters, params);
    }

    if (form.hasAttribute('method') && !options.method)
      options.method = form.method;

    return new Ajax.Request(action, options);
  }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
  focus: function(element) {
    $(element).focus();
    return element;
  },

  select: function(element) {
    $(element).select();
    return element;
  }
};

Form.Element.Methods = {
  serialize: function(element) {
    element = $(element);
    if (!element.disabled && element.name) {
      var value = element.getValue();
      if (value != undefined) {
        var pair = { };
        pair[element.name] = value;
        return Object.toQueryString(pair);
      }
    }
    return '';
  },

  getValue: function(element) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    return Form.Element.Serializers[method](element);
  },

  setValue: function(element, value) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    Form.Element.Serializers[method](element, value);
    return element;
  },

  clear: function(element) {
    $(element).value = '';
    return element;
  },

  present: function(element) {
    return $(element).value != '';
  },

  activate: function(element) {
    element = $(element);
    try {
      element.focus();
      if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
        element.select();
    } catch (e) { }
    return element;
  },

  disable: function(element) {
    element = $(element);
    element.disabled = true;
    return element;
  },

  enable: function(element) {
    element = $(element);
    element.disabled = false;
    return element;
  }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
  input: function(element, value) {
    switch (element.type.toLowerCase()) {
      case 'checkbox':
      case 'radio':
        return Form.Element.Serializers.inputSelector(element, value);
      default:
        return Form.Element.Serializers.textarea(element, value);
    }
  },

  inputSelector: function(element, value) {
    if (Object.isUndefined(value)) return element.checked ? element.value : null;
    else element.checked = !!value;
  },

  textarea: function(element, value) {
    if (Object.isUndefined(value)) return element.value;
    else element.value = value;
  },

  select: function(element, value) {
    if (Object.isUndefined(value))
      return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    else {
      var opt, currentValue, single = !Object.isArray(value);
      for (var i = 0, length = element.length; i < length; i++) {
        opt = element.options[i];
        currentValue = this.optionValue(opt);
        if (single) {
          if (currentValue == value) {
            opt.selected = true;
            return;
          }
        }
        else opt.selected = value.include(currentValue);
      }
    }
  },

  selectOne: function(element) {
    var index = element.selectedIndex;
    return index >= 0 ? this.optionValue(element.options[index]) : null;
  },

  selectMany: function(element) {
    var values, length = element.length;
    if (!length) return null;

    for (var i = 0, values = []; i < length; i++) {
      var opt = element.options[i];
      if (opt.selected) values.push(this.optionValue(opt));
    }
    return values;
  },

  optionValue: function(opt) {
    // extend element because hasAttribute may not be native
    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  initialize: function($super, element, frequency, callback) {
    $super(callback, frequency);
    this.element   = $(element);
    this.lastValue = this.getValue();
  },

  execute: function() {
    var value = this.getValue();
    if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
  initialize: function(element, callback) {
    this.element  = $(element);
    this.callback = callback;

    this.lastValue = this.getValue();
    if (this.element.tagName.toLowerCase() == 'form')
      this.registerFormCallbacks();
    else
      this.registerCallback(this.element);
  },

  onElementEvent: function() {
    var value = this.getValue();
    if (this.lastValue != value) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  },

  registerFormCallbacks: function() {
    Form.getElements(this.element).each(this.registerCallback, this);
  },

  registerCallback: function(element) {
    if (element.type) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          Event.observe(element, 'click', this.onElementEvent.bind(this));
          break;
        default:
          Event.observe(element, 'change', this.onElementEvent.bind(this));
          break;
      }
    }
  }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
if (!window.Event) var Event = { };

Object.extend(Event, {
  KEY_BACKSPACE: 8,
  KEY_TAB:       9,
  KEY_RETURN:   13,
  KEY_ESC:      27,
  KEY_LEFT:     37,
  KEY_UP:       38,
  KEY_RIGHT:    39,
  KEY_DOWN:     40,
  KEY_DELETE:   46,
  KEY_HOME:     36,
  KEY_END:      35,
  KEY_PAGEUP:   33,
  KEY_PAGEDOWN: 34,
  KEY_INSERT:   45,

  cache: { },

  relatedTarget: function(event) {
    var element;
    switch(event.type) {
      case 'mouseover': element = event.fromElement; break;
      case 'mouseout':  element = event.toElement;   break;
      default: return null;
    }
    return Element.extend(element);
  }
});

Event.Methods = (function() {
  var isButton;

  if (Prototype.Browser.IE) {
    var buttonMap = { 0: 1, 1: 4, 2: 2 };
    isButton = function(event, code) {
      return event.button == buttonMap[code];
    };

  } else if (Prototype.Browser.WebKit) {
    isButton = function(event, code) {
      switch (code) {
        case 0: return event.which == 1 && !event.metaKey;
        case 1: return event.which == 1 && event.metaKey;
        default: return false;
      }
    };

  } else {
    isButton = function(event, code) {
      return event.which ? (event.which === code + 1) : (event.button === code);
    };
  }

  return {
    isLeftClick:   function(event) { return isButton(event, 0) },
    isMiddleClick: function(event) { return isButton(event, 1) },
    isRightClick:  function(event) { return isButton(event, 2) },

    element: function(event) {
      event = Event.extend(event);

      var node          = event.target,
          type          = event.type,
          currentTarget = event.currentTarget;

      if (currentTarget && currentTarget.tagName) {
        // Firefox screws up the "click" event when moving between radio buttons
        // via arrow keys. It also screws up the "load" and "error" events on images,
        // reporting the document as the target instead of the original image.
        if (type === 'load' || type === 'error' ||
          (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
            && currentTarget.type === 'radio'))
              node = currentTarget;
      }
      if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
      return Element.extend(node);
    },

    findElement: function(event, expression) {
      var element = Event.element(event);
      if (!expression) return element;
      var elements = [element].concat(element.ancestors());
      return Selector.findElement(elements, expression, 0);
    },

    pointer: function(event) {
      var docElement = document.documentElement,
      body = document.body || { scrollLeft: 0, scrollTop: 0 };
      return {
        x: event.pageX || (event.clientX +
          (docElement.scrollLeft || body.scrollLeft) -
          (docElement.clientLeft || 0)),
        y: event.pageY || (event.clientY +
          (docElement.scrollTop || body.scrollTop) -
          (docElement.clientTop || 0))
      };
    },

    pointerX: function(event) { return Event.pointer(event).x },
    pointerY: function(event) { return Event.pointer(event).y },

    stop: function(event) {
      Event.extend(event);
      event.preventDefault();
      event.stopPropagation();
      event.stopped = true;
    }
  };
})();

Event.extend = (function() {
  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
    m[name] = Event.Methods[name].methodize();
    return m;
  });

  if (Prototype.Browser.IE) {
    Object.extend(methods, {
      stopPropagation: function() { this.cancelBubble = true },
      preventDefault:  function() { this.returnValue = false },
      inspect: function() { return "[object Event]" }
    });

    return function(event) {
      if (!event) return false;
      if (event._extendedByPrototype) return event;

      event._extendedByPrototype = Prototype.emptyFunction;
      var pointer = Event.pointer(event);
      Object.extend(event, {
        target: event.srcElement,
        relatedTarget: Event.relatedTarget(event),
        pageX:  pointer.x,
        pageY:  pointer.y
      });
      return Object.extend(event, methods);
    };

  } else {
    Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
    Object.extend(Event.prototype, methods);
    return Prototype.K;
  }
})();

Object.extend(Event, (function() {
  var cache = Event.cache;

  function getEventID(element) {
    if (element._prototypeEventID) return element._prototypeEventID[0];
    arguments.callee.id = arguments.callee.id || 1;
    return element._prototypeEventID = [++arguments.callee.id];
  }

  function getDOMEventName(eventName) {
    if (eventName && eventName.include(':')) return "dataavailable";
    return eventName;
  }

  function getCacheForID(id) {
    return cache[id] = cache[id] || { };
  }

  function getWrappersForEventName(id, eventName) {
    var c = getCacheForID(id);
    return c[eventName] = c[eventName] || [];
  }

  function createWrapper(element, eventName, handler) {
    var id = getEventID(element);
    var c = getWrappersForEventName(id, eventName);
    if (c.pluck("handler").include(handler)) return false;

    var wrapper = function(event) {
      if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
          return false;

      Event.extend(event);
      handler.call(element, event);
    };

    wrapper.handler = handler;
    c.push(wrapper);
    return wrapper;
  }

  function findWrapper(id, eventName, handler) {
    var c = getWrappersForEventName(id, eventName);
    return c.find(function(wrapper) { return wrapper.handler == handler });
  }

  function destroyWrapper(id, eventName, handler) {
    var c = getCacheForID(id);
    if (!c[eventName]) return false;
    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  }

  function destroyCache() {
    for (var id in cache)
      for (var eventName in cache[id])
        cache[id][eventName] = null;
  }


  // Internet Explorer needs to remove event handlers on page unload
  // in order to avoid memory leaks.
  if (window.attachEvent) {
    window.attachEvent("onunload", destroyCache);
  }

  // Safari has a dummy event handler on page unload so that it won't
  // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
  // object when page is returned to via the back button using its bfcache.
  if (Prototype.Browser.WebKit) {
    window.addEventListener('unload', Prototype.emptyFunction, false);
  }

  return {
    observe: function(element, eventName, handler) {
      element = $(element);
      var name = getDOMEventName(eventName);

      var wrapper = createWrapper(element, eventName, handler);
      if (!wrapper) return element;

      if (element.addEventListener) {
        element.addEventListener(name, wrapper, false);
      } else {
        element.attachEvent("on" + name, wrapper);
      }

      return element;
    },

    stopObserving: function(element, eventName, handler) {
      element = $(element);
      var id = getEventID(element), name = getDOMEventName(eventName);

      if (!handler && eventName) {
        getWrappersForEventName(id, eventName).each(function(wrapper) {
          element.stopObserving(eventName, wrapper.handler);
        });
        return element;

      } else if (!eventName) {
        Object.keys(getCacheForID(id)).each(function(eventName) {
          element.stopObserving(eventName);
        });
        return element;
      }

      var wrapper = findWrapper(id, eventName, handler);
      if (!wrapper) return element;

      if (element.removeEventListener) {
        element.removeEventListener(name, wrapper, false);
      } else {
        element.detachEvent("on" + name, wrapper);
      }

      destroyWrapper(id, eventName, handler);

      return element;
    },

    fire: function(element, eventName, memo) {
      element = $(element);
      if (element == document && document.createEvent && !element.dispatchEvent)
        element = document.documentElement;

      var event;
      if (document.createEvent) {
        event = document.createEvent("HTMLEvents");
        event.initEvent("dataavailable", true, true);
      } else {
        event = document.createEventObject();
        event.eventType = "ondataavailable";
      }

      event.eventName = eventName;
      event.memo = memo || { };

      if (document.createEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent(event.eventType, event);
      }

      return Event.extend(event);
    }
  };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
  fire:          Event.fire,
  observe:       Event.observe,
  stopObserving: Event.stopObserving
});

Object.extend(document, {
  fire:          Element.Methods.fire.methodize(),
  observe:       Element.Methods.observe.methodize(),
  stopObserving: Element.Methods.stopObserving.methodize(),
  loaded:        false
});

(function() {
  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards and John Resig. */

  var timer;

  function fireContentLoadedEvent() {
    if (document.loaded) return;
    if (timer) window.clearInterval(timer);
    document.fire("dom:loaded");
    document.loaded = true;
  }

  if (document.addEventListener) {
    if (Prototype.Browser.WebKit) {
      timer = window.setInterval(function() {
        if (/loaded|complete/.test(document.readyState))
          fireContentLoadedEvent();
      }, 0);

      Event.observe(window, "load", fireContentLoadedEvent);

    } else {
      document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
    }

  } else {
    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
    $("__onDOMContentLoaded").onreadystatechange = function() {
      if (this.readyState == "complete") {
        this.onreadystatechange = null;
        fireContentLoadedEvent();
      }
    };
  }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
  Before: function(element, content) {
    return Element.insert(element, {before:content});
  },

  Top: function(element, content) {
    return Element.insert(element, {top:content});
  },

  Bottom: function(element, content) {
    return Element.insert(element, {bottom:content});
  },

  After: function(element, content) {
    return Element.insert(element, {after:content});
  }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
  // set to true if needed, warning: firefox performance problems
  // NOT neeeded for page scrolling, only if draggable contained in
  // scrollable elements
  includeScrollOffsets: false,

  // must be called before calling withinIncludingScrolloffset, every time the
  // page is scrolled
  prepare: function() {
    this.deltaX =  window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
    this.deltaY =  window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
  },

  // caches x/y coordinate pair to use with overlap
  within: function(element, x, y) {
    if (this.includeScrollOffsets)
      return this.withinIncludingScrolloffsets(element, x, y);
    this.xcomp = x;
    this.ycomp = y;
    this.offset = Element.cumulativeOffset(element);

    return (y >= this.offset[1] &&
            y <  this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x <  this.offset[0] + element.offsetWidth);
  },

  withinIncludingScrolloffsets: function(element, x, y) {
    var offsetcache = Element.cumulativeScrollOffset(element);

    this.xcomp = x + offsetcache[0] - this.deltaX;
    this.ycomp = y + offsetcache[1] - this.deltaY;
    this.offset = Element.cumulativeOffset(element);

    return (this.ycomp >= this.offset[1] &&
            this.ycomp <  this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp <  this.offset[0] + element.offsetWidth);
  },

  // within must be called directly before
  overlap: function(mode, element) {
    if (!mode) return 0;
    if (mode == 'vertical')
      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
    if (mode == 'horizontal')
      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
  },

  // Deprecation layer -- use newer Element methods now (1.5.2).

  cumulativeOffset: Element.Methods.cumulativeOffset,

  positionedOffset: Element.Methods.positionedOffset,

  absolutize: function(element) {
    Position.prepare();
    return Element.absolutize(element);
  },

  relativize: function(element) {
    Position.prepare();
    return Element.relativize(element);
  },

  realOffset: Element.Methods.cumulativeScrollOffset,

  offsetParent: Element.Methods.getOffsetParent,

  page: Element.Methods.viewportOffset,

  clone: function(source, target, options) {
    options = options || { };
    return Element.clonePosition(target, source, options);
  }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  function iter(name) {
    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  }

  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
    className = className.toString().strip();
    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
    className = className.toString().strip();
    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
    if (!classNames && !className) return elements;

    var nodes = $(element).getElementsByTagName('*');
    className = ' ' + className + ' ';

    for (var i = 0, child, cn; child = nodes[i]; i++) {
      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
            return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
        elements.push(Element.extend(child));
    }
    return elements;
  };

  return function(className, parentElement) {
    return $(parentElement || document.body).getElementsByClassName(className);
  };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },

  _each: function(iterator) {
    this.element.className.split(/\s+/).select(function(name) {
      return name.length > 0;
    })._each(iterator);
  },

  set: function(className) {
    this.element.className = className;
  },

  add: function(classNameToAdd) {
    if (this.include(classNameToAdd)) return;
    this.set($A(this).concat(classNameToAdd).join(' '));
  },

  remove: function(classNameToRemove) {
    if (!this.include(classNameToRemove)) return;
    this.set($A(this).without(classNameToRemove).join(' '));
  },

  toString: function() {
    return $A(this).join(' ');
  }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();

// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// Contributors:
//  Justin Palmer (http://encytemedia.com/)
//  Mark Pilgrim (http://diveintomark.org/)
//  Martin Bialasinki
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

// converts rgb() and #xxx to #xxxxxx format,
// returns self (or first argument) if not convertable
String.prototype.parseColor = function() {
  var color = '#';
  if (this.slice(0,4) == 'rgb(') {
    var cols = this.slice(4,this.length-1).split(',');
    var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);
  } else {
    if (this.slice(0,1) == '#') {
      if (this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();
      if (this.length==7) color = this.toLowerCase();
    }
  }
  return (color.length==7 ? color : (arguments[0] || this));
};

/*--------------------------------------------------------------------------*/

Element.collectTextNodes = function(element) {
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue :
      (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
  }).flatten().join('');
};

Element.collectTextNodesIgnoreClass = function(element, className) {
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue :
      ((node.hasChildNodes() && !Element.hasClassName(node,className)) ?
        Element.collectTextNodesIgnoreClass(node, className) : ''));
  }).flatten().join('');
};

Element.setContentZoom = function(element, percent) {
  element = $(element);
  element.setStyle({fontSize: (percent/100) + 'em'});
  if (Prototype.Browser.WebKit) window.scrollBy(0,0);
  return element;
};

Element.getInlineOpacity = function(element){
  return $(element).style.opacity || '';
};

Element.forceRerendering = function(element) {
  try {
    element = $(element);
    var n = document.createTextNode(' ');
    element.appendChild(n);
    element.removeChild(n);
  } catch(e) { }
};

/*--------------------------------------------------------------------------*/

var Effect = {
  _elementDoesNotExistError: {
    name: 'ElementDoesNotExistError',
    message: 'The specified DOM element does not exist, but is required for this effect to operate'
  },
  Transitions: {
    linear: Prototype.K,
    sinoidal: function(pos) {
      return (-Math.cos(pos*Math.PI)/2) + .5;
    },
    reverse: function(pos) {
      return 1-pos;
    },
    flicker: function(pos) {
      var pos = ((-Math.cos(pos*Math.PI)/4) + .75) + Math.random()/4;
      return pos > 1 ? 1 : pos;
    },
    wobble: function(pos) {
      return (-Math.cos(pos*Math.PI*(9*pos))/2) + .5;
    },
    pulse: function(pos, pulses) {
      return (-Math.cos((pos*((pulses||5)-.5)*2)*Math.PI)/2) + .5;
    },
    spring: function(pos) {
      return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6));
    },
    none: function(pos) {
      return 0;
    },
    full: function(pos) {
      return 1;
    }
  },
  DefaultOptions: {
    duration:   1.0,   // seconds
    fps:        100,   // 100= assume 66fps max.
    sync:       false, // true for combining
    from:       0.0,
    to:         1.0,
    delay:      0.0,
    queue:      'parallel'
  },
  tagifyText: function(element) {
    var tagifyStyle = 'position:relative';
    if (Prototype.Browser.IE) tagifyStyle += ';zoom:1';

    element = $(element);
    $A(element.childNodes).each( function(child) {
      if (child.nodeType==3) {
        child.nodeValue.toArray().each( function(character) {
          element.insertBefore(
            new Element('span', {style: tagifyStyle}).update(
              character == ' ' ? String.fromCharCode(160) : character),
              child);
        });
        Element.remove(child);
      }
    });
  },
  multiple: function(element, effect) {
    var elements;
    if (((typeof element == 'object') ||
        Object.isFunction(element)) &&
       (element.length))
      elements = element;
    else
      elements = $(element).childNodes;

    var options = Object.extend({
      speed: 0.1,
      delay: 0.0
    }, arguments[2] || { });
    var masterDelay = options.delay;

    $A(elements).each( function(element, index) {
      new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
    });
  },
  PAIRS: {
    'slide':  ['SlideDown','SlideUp'],
    'blind':  ['BlindDown','BlindUp'],
    'appear': ['Appear','Fade']
  },
  toggle: function(element, effect) {
    element = $(element);
    effect = (effect || 'appear').toLowerCase();
    var options = Object.extend({
      queue: { position:'end', scope:(element.id || 'global'), limit: 1 }
    }, arguments[2] || { });
    Effect[element.visible() ?
      Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
  }
};

Effect.DefaultOptions.transition = Effect.Transitions.sinoidal;

/* ------------- core effects ------------- */

Effect.ScopedQueue = Class.create(Enumerable, {
  initialize: function() {
    this.effects  = [];
    this.interval = null;
  },
  _each: function(iterator) {
    this.effects._each(iterator);
  },
  add: function(effect) {
    var timestamp = new Date().getTime();

    var position = Object.isString(effect.options.queue) ?
      effect.options.queue : effect.options.queue.position;

    switch(position) {
      case 'front':
        // move unstarted effects after this effect
        this.effects.findAll(function(e){ return e.state=='idle' }).each( function(e) {
            e.startOn  += effect.finishOn;
            e.finishOn += effect.finishOn;
          });
        break;
      case 'with-last':
        timestamp = this.effects.pluck('startOn').max() || timestamp;
        break;
      case 'end':
        // start effect after last queued effect has finished
        timestamp = this.effects.pluck('finishOn').max() || timestamp;
        break;
    }

    effect.startOn  += timestamp;
    effect.finishOn += timestamp;

    if (!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
      this.effects.push(effect);

    if (!this.interval)
      this.interval = setInterval(this.loop.bind(this), 15);
  },
  remove: function(effect) {
    this.effects = this.effects.reject(function(e) { return e==effect });
    if (this.effects.length == 0) {
      clearInterval(this.interval);
      this.interval = null;
    }
  },
  loop: function() {
    var timePos = new Date().getTime();
    for(var i=0, len=this.effects.length;i<len;i++)
      this.effects[i] && this.effects[i].loop(timePos);
  }
});

Effect.Queues = {
  instances: $H(),
  get: function(queueName) {
    if (!Object.isString(queueName)) return queueName;

    return this.instances.get(queueName) ||
      this.instances.set(queueName, new Effect.ScopedQueue());
  }
};
Effect.Queue = Effect.Queues.get('global');

Effect.Base = Class.create({
  position: null,
  start: function(options) {
    function codeForEvent(options,eventName){
      return (
        (options[eventName+'Internal'] ? 'this.options.'+eventName+'Internal(this);' : '') +
        (options[eventName] ? 'this.options.'+eventName+'(this);' : '')
      );
    }
    if (options && options.transition === false) options.transition = Effect.Transitions.linear;
    this.options      = Object.extend(Object.extend({ },Effect.DefaultOptions), options || { });
    this.currentFrame = 0;
    this.state        = 'idle';
    this.startOn      = this.options.delay*1000;
    this.finishOn     = this.startOn+(this.options.duration*1000);
    this.fromToDelta  = this.options.to-this.options.from;
    this.totalTime    = this.finishOn-this.startOn;
    this.totalFrames  = this.options.fps*this.options.duration;

    this.render = (function() {
      function dispatch(effect, eventName) {
        if (effect.options[eventName + 'Internal'])
          effect.options[eventName + 'Internal'](effect);
        if (effect.options[eventName])
          effect.options[eventName](effect);
      }

      return function(pos) {
        if (this.state === "idle") {
          this.state = "running";
          dispatch(this, 'beforeSetup');
          if (this.setup) this.setup();
          dispatch(this, 'afterSetup');
        }
        if (this.state === "running") {
          pos = (this.options.transition(pos) * this.fromToDelta) + this.options.from;
          this.position = pos;
          dispatch(this, 'beforeUpdate');
          if (this.update) this.update(pos);
          dispatch(this, 'afterUpdate');
        }
      };
    })();

    this.event('beforeStart');
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ?
        'global' : this.options.queue.scope).add(this);
  },
  loop: function(timePos) {
    if (timePos >= this.startOn) {
      if (timePos >= this.finishOn) {
        this.render(1.0);
        this.cancel();
        this.event('beforeFinish');
        if (this.finish) this.finish();
        this.event('afterFinish');
        return;
      }
      var pos   = (timePos - this.startOn) / this.totalTime,
          frame = (pos * this.totalFrames).round();
      if (frame > this.currentFrame) {
        this.render(pos);
        this.currentFrame = frame;
      }
    }
  },
  cancel: function() {
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ?
        'global' : this.options.queue.scope).remove(this);
    this.state = 'finished';
  },
  event: function(eventName) {
    if (this.options[eventName + 'Internal']) this.options[eventName + 'Internal'](this);
    if (this.options[eventName]) this.options[eventName](this);
  },
  inspect: function() {
    var data = $H();
    for(property in this)
      if (!Object.isFunction(this[property])) data.set(property, this[property]);
    return '#<Effect:' + data.inspect() + ',options:' + $H(this.options).inspect() + '>';
  }
});

Effect.Parallel = Class.create(Effect.Base, {
  initialize: function(effects) {
    this.effects = effects || [];
    this.start(arguments[1]);
  },
  update: function(position) {
    this.effects.invoke('render', position);
  },
  finish: function(position) {
    this.effects.each( function(effect) {
      effect.render(1.0);
      effect.cancel();
      effect.event('beforeFinish');
      if (effect.finish) effect.finish(position);
      effect.event('afterFinish');
    });
  }
});

Effect.Tween = Class.create(Effect.Base, {
  initialize: function(object, from, to) {
    object = Object.isString(object) ? $(object) : object;
    var args = $A(arguments), method = args.last(),
      options = args.length == 5 ? args[3] : null;
    this.method = Object.isFunction(method) ? method.bind(object) :
      Object.isFunction(object[method]) ? object[method].bind(object) :
      function(value) { object[method] = value };
    this.start(Object.extend({ from: from, to: to }, options || { }));
  },
  update: function(position) {
    this.method(position);
  }
});

Effect.Event = Class.create(Effect.Base, {
  initialize: function() {
    this.start(Object.extend({ duration: 0 }, arguments[0] || { }));
  },
  update: Prototype.emptyFunction
});

Effect.Opacity = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    // make this work on IE on elements without 'layout'
    if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
      this.element.setStyle({zoom: 1});
    var options = Object.extend({
      from: this.element.getOpacity() || 0.0,
      to:   1.0
    }, arguments[1] || { });
    this.start(options);
  },
  update: function(position) {
    this.element.setOpacity(position);
  }
});

Effect.Move = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'relative'
    }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    this.element.makePositioned();
    this.originalLeft = parseFloat(this.element.getStyle('left') || '0');
    this.originalTop  = parseFloat(this.element.getStyle('top')  || '0');
    if (this.options.mode == 'absolute') {
      this.options.x = this.options.x - this.originalLeft;
      this.options.y = this.options.y - this.originalTop;
    }
  },
  update: function(position) {
    this.element.setStyle({
      left: (this.options.x  * position + this.originalLeft).round() + 'px',
      top:  (this.options.y  * position + this.originalTop).round()  + 'px'
    });
  }
});

// for backwards compatibility
Effect.MoveBy = function(element, toTop, toLeft) {
  return new Effect.Move(element,
    Object.extend({ x: toLeft, y: toTop }, arguments[3] || { }));
};

Effect.Scale = Class.create(Effect.Base, {
  initialize: function(element, percent) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      scaleX: true,
      scaleY: true,
      scaleContent: true,
      scaleFromCenter: false,
      scaleMode: 'box',        // 'box' or 'contents' or { } with provided values
      scaleFrom: 100.0,
      scaleTo:   percent
    }, arguments[2] || { });
    this.start(options);
  },
  setup: function() {
    this.restoreAfterFinish = this.options.restoreAfterFinish || false;
    this.elementPositioning = this.element.getStyle('position');

    this.originalStyle = { };
    ['top','left','width','height','fontSize'].each( function(k) {
      this.originalStyle[k] = this.element.style[k];
    }.bind(this));

    this.originalTop  = this.element.offsetTop;
    this.originalLeft = this.element.offsetLeft;

    var fontSize = this.element.getStyle('font-size') || '100%';
    ['em','px','%','pt'].each( function(fontSizeType) {
      if (fontSize.indexOf(fontSizeType)>0) {
        this.fontSize     = parseFloat(fontSize);
        this.fontSizeType = fontSizeType;
      }
    }.bind(this));

    this.factor = (this.options.scaleTo - this.options.scaleFrom)/100;

    this.dims = null;
    if (this.options.scaleMode=='box')
      this.dims = [this.element.offsetHeight, this.element.offsetWidth];
    if (/^content/.test(this.options.scaleMode))
      this.dims = [this.element.scrollHeight, this.element.scrollWidth];
    if (!this.dims)
      this.dims = [this.options.scaleMode.originalHeight,
                   this.options.scaleMode.originalWidth];
  },
  update: function(position) {
    var currentScale = (this.options.scaleFrom/100.0) + (this.factor * position);
    if (this.options.scaleContent && this.fontSize)
      this.element.setStyle({fontSize: this.fontSize * currentScale + this.fontSizeType });
    this.setDimensions(this.dims[0] * currentScale, this.dims[1] * currentScale);
  },
  finish: function(position) {
    if (this.restoreAfterFinish) this.element.setStyle(this.originalStyle);
  },
  setDimensions: function(height, width) {
    var d = { };
    if (this.options.scaleX) d.width = width.round() + 'px';
    if (this.options.scaleY) d.height = height.round() + 'px';
    if (this.options.scaleFromCenter) {
      var topd  = (height - this.dims[0])/2;
      var leftd = (width  - this.dims[1])/2;
      if (this.elementPositioning == 'absolute') {
        if (this.options.scaleY) d.top = this.originalTop-topd + 'px';
        if (this.options.scaleX) d.left = this.originalLeft-leftd + 'px';
      } else {
        if (this.options.scaleY) d.top = -topd + 'px';
        if (this.options.scaleX) d.left = -leftd + 'px';
      }
    }
    this.element.setStyle(d);
  }
});

Effect.Highlight = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({ startcolor: '#ffff99' }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    // Prevent executing on elements not in the layout flow
    if (this.element.getStyle('display')=='none') { this.cancel(); return; }
    // Disable background image during the effect
    this.oldStyle = { };
    if (!this.options.keepBackgroundImage) {
      this.oldStyle.backgroundImage = this.element.getStyle('background-image');
      this.element.setStyle({backgroundImage: 'none'});
    }
    if (!this.options.endcolor)
      this.options.endcolor = this.element.getStyle('background-color').parseColor('#ffffff');
    if (!this.options.restorecolor)
      this.options.restorecolor = this.element.getStyle('background-color');
    // init color calculations
    this._base  = $R(0,2).map(function(i){ return parseInt(this.options.startcolor.slice(i*2+1,i*2+3),16) }.bind(this));
    this._delta = $R(0,2).map(function(i){ return parseInt(this.options.endcolor.slice(i*2+1,i*2+3),16)-this._base[i] }.bind(this));
  },
  update: function(position) {
    this.element.setStyle({backgroundColor: $R(0,2).inject('#',function(m,v,i){
      return m+((this._base[i]+(this._delta[i]*position)).round().toColorPart()); }.bind(this)) });
  },
  finish: function() {
    this.element.setStyle(Object.extend(this.oldStyle, {
      backgroundColor: this.options.restorecolor
    }));
  }
});

Effect.ScrollTo = function(element) {
  var options = arguments[1] || { },
  scrollOffsets = document.viewport.getScrollOffsets(),
  elementOffsets = $(element).cumulativeOffset();

  if (options.offset) elementOffsets[1] += options.offset;

  return new Effect.Tween(null,
    scrollOffsets.top,
    elementOffsets[1],
    options,
    function(p){ scrollTo(scrollOffsets.left, p.round()); }
  );
};

/* ------------- combination effects ------------- */

Effect.Fade = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  var options = Object.extend({
    from: element.getOpacity() || 1.0,
    to:   0.0,
    afterFinishInternal: function(effect) {
      if (effect.options.to!=0) return;
      effect.element.hide().setStyle({opacity: oldOpacity});
    }
  }, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Appear = function(element) {
  element = $(element);
  var options = Object.extend({
  from: (element.getStyle('display') == 'none' ? 0.0 : element.getOpacity() || 0.0),
  to:   1.0,
  // force Safari to render floated elements properly
  afterFinishInternal: function(effect) {
    effect.element.forceRerendering();
  },
  beforeSetup: function(effect) {
    effect.element.setOpacity(effect.options.from).show();
  }}, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Puff = function(element) {
  element = $(element);
  var oldStyle = {
    opacity: element.getInlineOpacity(),
    position: element.getStyle('position'),
    top:  element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height
  };
  return new Effect.Parallel(
   [ new Effect.Scale(element, 200,
      { sync: true, scaleFromCenter: true, scaleContent: true, restoreAfterFinish: true }),
     new Effect.Opacity(element, { sync: true, to: 0.0 } ) ],
     Object.extend({ duration: 1.0,
      beforeSetupInternal: function(effect) {
        Position.absolutize(effect.effects[0].element);
      },
      afterFinishInternal: function(effect) {
         effect.effects[0].element.hide().setStyle(oldStyle); }
     }, arguments[1] || { })
   );
};

Effect.BlindUp = function(element) {
  element = $(element);
  element.makeClipping();
  return new Effect.Scale(element, 0,
    Object.extend({ scaleContent: false,
      scaleX: false,
      restoreAfterFinish: true,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping();
      }
    }, arguments[1] || { })
  );
};

Effect.BlindDown = function(element) {
  element = $(element);
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({
    scaleContent: false,
    scaleX: false,
    scaleFrom: 0,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makeClipping().setStyle({height: '0px'}).show();
    },
    afterFinishInternal: function(effect) {
      effect.element.undoClipping();
    }
  }, arguments[1] || { }));
};

Effect.SwitchOff = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  return new Effect.Appear(element, Object.extend({
    duration: 0.4,
    from: 0,
    transition: Effect.Transitions.flicker,
    afterFinishInternal: function(effect) {
      new Effect.Scale(effect.element, 1, {
        duration: 0.3, scaleFromCenter: true,
        scaleX: false, scaleContent: false, restoreAfterFinish: true,
        beforeSetup: function(effect) {
          effect.element.makePositioned().makeClipping();
        },
        afterFinishInternal: function(effect) {
          effect.element.hide().undoClipping().undoPositioned().setStyle({opacity: oldOpacity});
        }
      });
    }
  }, arguments[1] || { }));
};

Effect.DropOut = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left'),
    opacity: element.getInlineOpacity() };
  return new Effect.Parallel(
    [ new Effect.Move(element, {x: 0, y: 100, sync: true }),
      new Effect.Opacity(element, { sync: true, to: 0.0 }) ],
    Object.extend(
      { duration: 0.5,
        beforeSetup: function(effect) {
          effect.effects[0].element.makePositioned();
        },
        afterFinishInternal: function(effect) {
          effect.effects[0].element.hide().undoPositioned().setStyle(oldStyle);
        }
      }, arguments[1] || { }));
};

Effect.Shake = function(element) {
  element = $(element);
  var options = Object.extend({
    distance: 20,
    duration: 0.5
  }, arguments[1] || {});
  var distance = parseFloat(options.distance);
  var split = parseFloat(options.duration) / 10.0;
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left') };
    return new Effect.Move(element,
      { x:  distance, y: 0, duration: split, afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance, y: 0, duration: split, afterFinishInternal: function(effect) {
        effect.element.undoPositioned().setStyle(oldStyle);
  }}); }}); }}); }}); }}); }});
};

Effect.SlideDown = function(element) {
  element = $(element).cleanWhitespace();
  // SlideDown need to have the content of the element wrapped in a container element with fixed height!
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({
    scaleContent: false,
    scaleX: false,
    scaleFrom: window.opera ? 0 : 1,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().setStyle({height: '0px'}).show();
    },
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' });
    },
    afterFinishInternal: function(effect) {
      effect.element.undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom}); }
    }, arguments[1] || { })
  );
};

Effect.SlideUp = function(element) {
  element = $(element).cleanWhitespace();
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, window.opera ? 0 : 1,
   Object.extend({ scaleContent: false,
    scaleX: false,
    scaleMode: 'box',
    scaleFrom: 100,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().show();
    },
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' });
    },
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom});
    }
   }, arguments[1] || { })
  );
};

// Bug in opera makes the TD containing this element expand for a instance after finish
Effect.Squish = function(element) {
  return new Effect.Scale(element, window.opera ? 1 : 0, {
    restoreAfterFinish: true,
    beforeSetup: function(effect) {
      effect.element.makeClipping();
    },
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping();
    }
  });
};

Effect.Grow = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.full
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();
  var initialMoveX, initialMoveY;
  var moveX, moveY;

  switch (options.direction) {
    case 'top-left':
      initialMoveX = initialMoveY = moveX = moveY = 0;
      break;
    case 'top-right':
      initialMoveX = dims.width;
      initialMoveY = moveY = 0;
      moveX = -dims.width;
      break;
    case 'bottom-left':
      initialMoveX = moveX = 0;
      initialMoveY = dims.height;
      moveY = -dims.height;
      break;
    case 'bottom-right':
      initialMoveX = dims.width;
      initialMoveY = dims.height;
      moveX = -dims.width;
      moveY = -dims.height;
      break;
    case 'center':
      initialMoveX = dims.width / 2;
      initialMoveY = dims.height / 2;
      moveX = -dims.width / 2;
      moveY = -dims.height / 2;
      break;
  }

  return new Effect.Move(element, {
    x: initialMoveX,
    y: initialMoveY,
    duration: 0.01,
    beforeSetup: function(effect) {
      effect.element.hide().makeClipping().makePositioned();
    },
    afterFinishInternal: function(effect) {
      new Effect.Parallel(
        [ new Effect.Opacity(effect.element, { sync: true, to: 1.0, from: 0.0, transition: options.opacityTransition }),
          new Effect.Move(effect.element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition }),
          new Effect.Scale(effect.element, 100, {
            scaleMode: { originalHeight: dims.height, originalWidth: dims.width },
            sync: true, scaleFrom: window.opera ? 1 : 0, transition: options.scaleTransition, restoreAfterFinish: true})
        ], Object.extend({
             beforeSetup: function(effect) {
               effect.effects[0].element.setStyle({height: '0px'}).show();
             },
             afterFinishInternal: function(effect) {
               effect.effects[0].element.undoClipping().undoPositioned().setStyle(oldStyle);
             }
           }, options)
      );
    }
  });
};

Effect.Shrink = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.none
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();
  var moveX, moveY;

  switch (options.direction) {
    case 'top-left':
      moveX = moveY = 0;
      break;
    case 'top-right':
      moveX = dims.width;
      moveY = 0;
      break;
    case 'bottom-left':
      moveX = 0;
      moveY = dims.height;
      break;
    case 'bottom-right':
      moveX = dims.width;
      moveY = dims.height;
      break;
    case 'center':
      moveX = dims.width / 2;
      moveY = dims.height / 2;
      break;
  }

  return new Effect.Parallel(
    [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: options.opacityTransition }),
      new Effect.Scale(element, window.opera ? 1 : 0, { sync: true, transition: options.scaleTransition, restoreAfterFinish: true}),
      new Effect.Move(element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition })
    ], Object.extend({
         beforeStartInternal: function(effect) {
           effect.effects[0].element.makePositioned().makeClipping();
         },
         afterFinishInternal: function(effect) {
           effect.effects[0].element.hide().undoClipping().undoPositioned().setStyle(oldStyle); }
       }, options)
  );
};

Effect.Pulsate = function(element) {
  element = $(element);
  var options    = arguments[1] || { },
    oldOpacity = element.getInlineOpacity(),
    transition = options.transition || Effect.Transitions.linear,
    reverser   = function(pos){
      return 1 - transition((-Math.cos((pos*(options.pulses||5)*2)*Math.PI)/2) + .5);
    };

  return new Effect.Opacity(element,
    Object.extend(Object.extend({  duration: 2.0, from: 0,
      afterFinishInternal: function(effect) { effect.element.setStyle({opacity: oldOpacity}); }
    }, options), {transition: reverser}));
};

Effect.Fold = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height };
  element.makeClipping();
  return new Effect.Scale(element, 5, Object.extend({
    scaleContent: false,
    scaleX: false,
    afterFinishInternal: function(effect) {
    new Effect.Scale(element, 1, {
      scaleContent: false,
      scaleY: false,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping().setStyle(oldStyle);
      } });
  }}, arguments[1] || { }));
};

Effect.Morph = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      style: { }
    }, arguments[1] || { });

    if (!Object.isString(options.style)) this.style = $H(options.style);
    else {
      if (options.style.include(':'))
        this.style = options.style.parseStyle();
      else {
        this.element.addClassName(options.style);
        this.style = $H(this.element.getStyles());
        this.element.removeClassName(options.style);
        var css = this.element.getStyles();
        this.style = this.style.reject(function(style) {
          return style.value == css[style.key];
        });
        options.afterFinishInternal = function(effect) {
          effect.element.addClassName(effect.options.style);
          effect.transforms.each(function(transform) {
            effect.element.style[transform.style] = '';
          });
        };
      }
    }
    this.start(options);
  },

  setup: function(){
    function parseColor(color){
      if (!color || ['rgba(0, 0, 0, 0)','transparent'].include(color)) color = '#ffffff';
      color = color.parseColor();
      return $R(0,2).map(function(i){
        return parseInt( color.slice(i*2+1,i*2+3), 16 );
      });
    }
    this.transforms = this.style.map(function(pair){
      var property = pair[0], value = pair[1], unit = null;

      if (value.parseColor('#zzzzzz') != '#zzzzzz') {
        value = value.parseColor();
        unit  = 'color';
      } else if (property == 'opacity') {
        value = parseFloat(value);
        if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
          this.element.setStyle({zoom: 1});
      } else if (Element.CSS_LENGTH.test(value)) {
          var components = value.match(/^([\+\-]?[0-9\.]+)(.*)$/);
          value = parseFloat(components[1]);
          unit = (components.length == 3) ? components[2] : null;
      }

      var originalValue = this.element.getStyle(property);
      return {
        style: property.camelize(),
        originalValue: unit=='color' ? parseColor(originalValue) : parseFloat(originalValue || 0),
        targetValue: unit=='color' ? parseColor(value) : value,
        unit: unit
      };
    }.bind(this)).reject(function(transform){
      return (
        (transform.originalValue == transform.targetValue) ||
        (
          transform.unit != 'color' &&
          (isNaN(transform.originalValue) || isNaN(transform.targetValue))
        )
      );
    });
  },
  update: function(position) {
    var style = { }, transform, i = this.transforms.length;
    while(i--)
      style[(transform = this.transforms[i]).style] =
        transform.unit=='color' ? '#'+
          (Math.round(transform.originalValue[0]+
            (transform.targetValue[0]-transform.originalValue[0])*position)).toColorPart() +
          (Math.round(transform.originalValue[1]+
            (transform.targetValue[1]-transform.originalValue[1])*position)).toColorPart() +
          (Math.round(transform.originalValue[2]+
            (transform.targetValue[2]-transform.originalValue[2])*position)).toColorPart() :
        (transform.originalValue +
          (transform.targetValue - transform.originalValue) * position).toFixed(3) +
            (transform.unit === null ? '' : transform.unit);
    this.element.setStyle(style, true);
  }
});

Effect.Transform = Class.create({
  initialize: function(tracks){
    this.tracks  = [];
    this.options = arguments[1] || { };
    this.addTracks(tracks);
  },
  addTracks: function(tracks){
    tracks.each(function(track){
      track = $H(track);
      var data = track.values().first();
      this.tracks.push($H({
        ids:     track.keys().first(),
        effect:  Effect.Morph,
        options: { style: data }
      }));
    }.bind(this));
    return this;
  },
  play: function(){
    return new Effect.Parallel(
      this.tracks.map(function(track){
        var ids = track.get('ids'), effect = track.get('effect'), options = track.get('options');
        var elements = [$(ids) || $$(ids)].flatten();
        return elements.map(function(e){ return new effect(e, Object.extend({ sync:true }, options)) });
      }).flatten(),
      this.options
    );
  }
});

Element.CSS_PROPERTIES = $w(
  'backgroundColor backgroundPosition borderBottomColor borderBottomStyle ' +
  'borderBottomWidth borderLeftColor borderLeftStyle borderLeftWidth ' +
  'borderRightColor borderRightStyle borderRightWidth borderSpacing ' +
  'borderTopColor borderTopStyle borderTopWidth bottom clip color ' +
  'fontSize fontWeight height left letterSpacing lineHeight ' +
  'marginBottom marginLeft marginRight marginTop markerOffset maxHeight '+
  'maxWidth minHeight minWidth opacity outlineColor outlineOffset ' +
  'outlineWidth paddingBottom paddingLeft paddingRight paddingTop ' +
  'right textIndent top width wordSpacing zIndex');

Element.CSS_LENGTH = /^(([\+\-]?[0-9\.]+)(em|ex|px|in|cm|mm|pt|pc|\%))|0$/;

String.__parseStyleElement = document.createElement('div');
String.prototype.parseStyle = function(){
  var style, styleRules = $H();
  if (Prototype.Browser.WebKit)
    style = new Element('div',{style:this}).style;
  else {
    String.__parseStyleElement.innerHTML = '<div style="' + this + '"></div>';
    style = String.__parseStyleElement.childNodes[0].style;
  }

  Element.CSS_PROPERTIES.each(function(property){
    if (style[property]) styleRules.set(property, style[property]);
  });

  if (Prototype.Browser.IE && this.include('opacity'))
    styleRules.set('opacity', this.match(/opacity:\s*((?:0|1)?(?:\.\d*)?)/)[1]);

  return styleRules;
};

if (document.defaultView && document.defaultView.getComputedStyle) {
  Element.getStyles = function(element) {
    var css = document.defaultView.getComputedStyle($(element), null);
    return Element.CSS_PROPERTIES.inject({ }, function(styles, property) {
      styles[property] = css[property];
      return styles;
    });
  };
} else {
  Element.getStyles = function(element) {
    element = $(element);
    var css = element.currentStyle, styles;
    styles = Element.CSS_PROPERTIES.inject({ }, function(results, property) {
      results[property] = css[property];
      return results;
    });
    if (!styles.opacity) styles.opacity = element.getOpacity();
    return styles;
  };
}

Effect.Methods = {
  morph: function(element, style) {
    element = $(element);
    new Effect.Morph(element, Object.extend({ style: style }, arguments[2] || { }));
    return element;
  },
  visualEffect: function(element, effect, options) {
    element = $(element);
    var s = effect.dasherize().camelize(), klass = s.charAt(0).toUpperCase() + s.substring(1);
    new Effect[klass](element, options);
    return element;
  },
  highlight: function(element, options) {
    element = $(element);
    new Effect.Highlight(element, options);
    return element;
  }
};

$w('fade appear grow shrink fold blindUp blindDown slideUp slideDown '+
  'pulsate shake puff squish switchOff dropOut').each(
  function(effect) {
    Effect.Methods[effect] = function(element, options){
      element = $(element);
      Effect[effect.charAt(0).toUpperCase() + effect.substring(1)](element, options);
      return element;
    };
  }
);

$w('getInlineOpacity forceRerendering setContentZoom collectTextNodes collectTextNodesIgnoreClass getStyles').each(
  function(f) { Effect.Methods[f] = Element[f]; }
);

Element.addMethods(Effect.Methods);

// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2008 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

if(Object.isUndefined(Effect))
  throw("dragdrop.js requires including script.aculo.us' effects.js library");

var Droppables = {
  drops: [],

  remove: function(element) {
    this.drops = this.drops.reject(function(d) { return d.element==$(element) });
  },

  add: function(element) {
    element = $(element);
    var options = Object.extend({
      greedy:     true,
      hoverclass: null,
      tree:       false
    }, arguments[1] || { });

    // cache containers
    if(options.containment) {
      options._containers = [];
      var containment = options.containment;
      if(Object.isArray(containment)) {
        containment.each( function(c) { options._containers.push($(c)) });
      } else {
        options._containers.push($(containment));
      }
    }

    if(options.accept) options.accept = [options.accept].flatten();

    Element.makePositioned(element); // fix IE
    options.element = element;

    this.drops.push(options);
  },

  findDeepestChild: function(drops) {
    deepest = drops[0];

    for (i = 1; i < drops.length; ++i)
      if (Element.isParent(drops[i].element, deepest.element))
        deepest = drops[i];

    return deepest;
  },

  isContained: function(element, drop) {
    var containmentNode;
    if(drop.tree) {
      containmentNode = element.treeNode;
    } else {
      containmentNode = element.parentNode;
    }
    return drop._containers.detect(function(c) { return containmentNode == c });
  },

  isAffected: function(point, element, drop) {
    return (
      (drop.element!=element) &&
      ((!drop._containers) ||
        this.isContained(element, drop)) &&
      ((!drop.accept) ||
        (Element.classNames(element).detect(
          function(v) { return drop.accept.include(v) } ) )) &&
      Position.within(drop.element, point[0], point[1]) );
  },

  deactivate: function(drop) {
    if(drop.hoverclass)
      Element.removeClassName(drop.element, drop.hoverclass);
    this.last_active = null;
  },

  activate: function(drop) {
    if(drop.hoverclass)
      Element.addClassName(drop.element, drop.hoverclass);
    this.last_active = drop;
  },

  show: function(point, element) {
    if(!this.drops.length) return;
    var drop, affected = [];

    this.drops.each( function(drop) {
      if(Droppables.isAffected(point, element, drop))
        affected.push(drop);
    });

    if(affected.length>0)
      drop = Droppables.findDeepestChild(affected);

    if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
    if (drop) {
      Position.within(drop.element, point[0], point[1]);
      if(drop.onHover)
        drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));

      if (drop != this.last_active) Droppables.activate(drop);
    }
  },

  fire: function(event, element) {
    if(!this.last_active) return;
    Position.prepare();

    if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
      if (this.last_active.onDrop) {
        this.last_active.onDrop(element, this.last_active.element, event);
        return true;
      }
  },

  reset: function() {
    if(this.last_active)
      this.deactivate(this.last_active);
  }
};

var Draggables = {
  drags: [],
  observers: [],

  register: function(draggable) {
    if(this.drags.length == 0) {
      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
      this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
      this.eventKeypress  = this.keyPress.bindAsEventListener(this);

      Event.observe(document, "mouseup", this.eventMouseUp);
      Event.observe(document, "mousemove", this.eventMouseMove);
      Event.observe(document, "keypress", this.eventKeypress);
    }
    this.drags.push(draggable);
  },

  unregister: function(draggable) {
    this.drags = this.drags.reject(function(d) { return d==draggable });
    if(this.drags.length == 0) {
      Event.stopObserving(document, "mouseup", this.eventMouseUp);
      Event.stopObserving(document, "mousemove", this.eventMouseMove);
      Event.stopObserving(document, "keypress", this.eventKeypress);
    }
  },

  activate: function(draggable) {
    if(draggable.options.delay) {
      this._timeout = setTimeout(function() {
        Draggables._timeout = null;
        window.focus();
        Draggables.activeDraggable = draggable;
      }.bind(this), draggable.options.delay);
    } else {
      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
      this.activeDraggable = draggable;
    }
  },

  deactivate: function() {
    this.activeDraggable = null;
  },

  updateDrag: function(event) {
    if(!this.activeDraggable) return;
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    // Mozilla-based browsers fire successive mousemove events with
    // the same coordinates, prevent needless redrawing (moz bug?)
    if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
    this._lastPointer = pointer;

    this.activeDraggable.updateDrag(event, pointer);
  },

  endDrag: function(event) {
    if(this._timeout) {
      clearTimeout(this._timeout);
      this._timeout = null;
    }
    if(!this.activeDraggable) return;
    this._lastPointer = null;
    this.activeDraggable.endDrag(event);
    this.activeDraggable = null;
  },

  keyPress: function(event) {
    if(this.activeDraggable)
      this.activeDraggable.keyPress(event);
  },

  addObserver: function(observer) {
    this.observers.push(observer);
    this._cacheObserverCallbacks();
  },

  removeObserver: function(element) {  // element instead of observer fixes mem leaks
    this.observers = this.observers.reject( function(o) { return o.element==element });
    this._cacheObserverCallbacks();
  },

  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
    if(this[eventName+'Count'] > 0)
      this.observers.each( function(o) {
        if(o[eventName]) o[eventName](eventName, draggable, event);
      });
    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
  },

  _cacheObserverCallbacks: function() {
    ['onStart','onEnd','onDrag'].each( function(eventName) {
      Draggables[eventName+'Count'] = Draggables.observers.select(
        function(o) { return o[eventName]; }
      ).length;
    });
  }
};

/*--------------------------------------------------------------------------*/

var Draggable = Class.create({
  initialize: function(element) {
    var defaults = {
      handle: false,
      reverteffect: function(element, top_offset, left_offset) {
        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
          queue: {scope:'_draggable', position:'end'}
        });
      },
      endeffect: function(element) {
        var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,
          queue: {scope:'_draggable', position:'end'},
          afterFinish: function(){
            Draggable._dragging[element] = false
          }
        });
      },
      zindex: 1000,
      revert: false,
      quiet: false,
      scroll: false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
      delay: 0
    };

    if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
      Object.extend(defaults, {
        starteffect: function(element) {
          element._opacity = Element.getOpacity(element);
          Draggable._dragging[element] = true;
          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
        }
      });

    var options = Object.extend(defaults, arguments[1] || { });

    this.element = $(element);

    if(options.handle && Object.isString(options.handle))
      this.handle = this.element.down('.'+options.handle, 0);

    if(!this.handle) this.handle = $(options.handle);
    if(!this.handle) this.handle = this.element;

    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
      options.scroll = $(options.scroll);
      this._isScrollChild = Element.childOf(this.element, options.scroll);
    }

    Element.makePositioned(this.element); // fix IE

    this.options  = options;
    this.dragging = false;

    this.eventMouseDown = this.initDrag.bindAsEventListener(this);
    Event.observe(this.handle, "mousedown", this.eventMouseDown);

    Draggables.register(this);
  },

  destroy: function() {
    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
    Draggables.unregister(this);
  },

  currentDelta: function() {
    return([
      parseInt(Element.getStyle(this.element,'left') || '0'),
      parseInt(Element.getStyle(this.element,'top') || '0')]);
  },

  initDrag: function(event) {
    if(!Object.isUndefined(Draggable._dragging[this.element]) &&
      Draggable._dragging[this.element]) return;
    if(Event.isLeftClick(event)) {
      // abort on form elements, fixes a Firefox issue
      var src = Event.element(event);
      if((tag_name = src.tagName.toUpperCase()) && (
        tag_name=='INPUT' ||
        tag_name=='SELECT' ||
        tag_name=='OPTION' ||
        tag_name=='BUTTON' ||
        tag_name=='TEXTAREA')) return;

      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      var pos     = Position.cumulativeOffset(this.element);
      this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });

      Draggables.activate(this);
      Event.stop(event);
    }
  },

  startDrag: function(event) {
    this.dragging = true;
    if(!this.delta)
      this.delta = this.currentDelta();

    if(this.options.zindex) {
      this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
      this.element.style.zIndex = this.options.zindex;
    }

    if(this.options.ghosting) {
      this._clone = this.element.cloneNode(true);
      this._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
      if (!this._originallyAbsolute)
        Position.absolutize(this.element);
      this.element.parentNode.insertBefore(this._clone, this.element);
    }

    if(this.options.scroll) {
      if (this.options.scroll == window) {
        var where = this._getWindowScroll(this.options.scroll);
        this.originalScrollLeft = where.left;
        this.originalScrollTop = where.top;
      } else {
        this.originalScrollLeft = this.options.scroll.scrollLeft;
        this.originalScrollTop = this.options.scroll.scrollTop;
      }
    }

    Draggables.notify('onStart', this, event);

    if(this.options.starteffect) this.options.starteffect(this.element);
  },

  updateDrag: function(event, pointer) {
    if(!this.dragging) this.startDrag(event);

    if(!this.options.quiet){
      Position.prepare();
      Droppables.show(pointer, this.element);
    }

    Draggables.notify('onDrag', this, event);

    this.draw(pointer);
    if(this.options.change) this.options.change(this);

    if(this.options.scroll) {
      this.stopScrolling();

      var p;
      if (this.options.scroll == window) {
        with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
      } else {
        p = Position.page(this.options.scroll);
        p[0] += this.options.scroll.scrollLeft + Position.deltaX;
        p[1] += this.options.scroll.scrollTop + Position.deltaY;
        p.push(p[0]+this.options.scroll.offsetWidth);
        p.push(p[1]+this.options.scroll.offsetHeight);
      }
      var speed = [0,0];
      if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
      if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
      if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
      if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
      this.startScrolling(speed);
    }

    // fix AppleWebKit rendering
    if(Prototype.Browser.WebKit) window.scrollBy(0,0);

    Event.stop(event);
  },

  finishDrag: function(event, success) {
    this.dragging = false;

    if(this.options.quiet){
      Position.prepare();
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      Droppables.show(pointer, this.element);
    }

    if(this.options.ghosting) {
      if (!this._originallyAbsolute)
        Position.relativize(this.element);
      delete this._originallyAbsolute;
      Element.remove(this._clone);
      this._clone = null;
    }

    var dropped = false;
    if(success) {
      dropped = Droppables.fire(event, this.element);
      if (!dropped) dropped = false;
    }
    if(dropped && this.options.onDropped) this.options.onDropped(this.element);
    Draggables.notify('onEnd', this, event);

    var revert = this.options.revert;
    if(revert && Object.isFunction(revert)) revert = revert(this.element);

    var d = this.currentDelta();
    if(revert && this.options.reverteffect) {
      if (dropped == 0 || revert != 'failure')
        this.options.reverteffect(this.element,
          d[1]-this.delta[1], d[0]-this.delta[0]);
    } else {
      this.delta = d;
    }

    if(this.options.zindex)
      this.element.style.zIndex = this.originalZ;

    if(this.options.endeffect)
      this.options.endeffect(this.element);

    Draggables.deactivate(this);
    Droppables.reset();
  },

  keyPress: function(event) {
    if(event.keyCode!=Event.KEY_ESC) return;
    this.finishDrag(event, false);
    Event.stop(event);
  },

  endDrag: function(event) {
    if(!this.dragging) return;
    this.stopScrolling();
    this.finishDrag(event, true);
    Event.stop(event);
  },

  draw: function(point) {
    var pos = Position.cumulativeOffset(this.element);
    if(this.options.ghosting) {
      var r   = Position.realOffset(this.element);
      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
    }

    var d = this.currentDelta();
    pos[0] -= d[0]; pos[1] -= d[1];

    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
      pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
      pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
    }

    var p = [0,1].map(function(i){
      return (point[i]-pos[i]-this.offset[i])
    }.bind(this));

    if(this.options.snap) {
      if(Object.isFunction(this.options.snap)) {
        p = this.options.snap(p[0],p[1],this);
      } else {
      if(Object.isArray(this.options.snap)) {
        p = p.map( function(v, i) {
          return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this));
      } else {
        p = p.map( function(v) {
          return (v/this.options.snap).round()*this.options.snap }.bind(this));
      }
    }}

    var style = this.element.style;
    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
      style.left = p[0] + "px";
    if((!this.options.constraint) || (this.options.constraint=='vertical'))
      style.top  = p[1] + "px";

    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
  },

  stopScrolling: function() {
    if(this.scrollInterval) {
      clearInterval(this.scrollInterval);
      this.scrollInterval = null;
      Draggables._lastScrollPointer = null;
    }
  },

  startScrolling: function(speed) {
    if(!(speed[0] || speed[1])) return;
    this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
    this.lastScrolled = new Date();
    this.scrollInterval = setInterval(this.scroll.bind(this), 10);
  },

  scroll: function() {
    var current = new Date();
    var delta = current - this.lastScrolled;
    this.lastScrolled = current;
    if(this.options.scroll == window) {
      with (this._getWindowScroll(this.options.scroll)) {
        if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
          var d = delta / 1000;
          this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
        }
      }
    } else {
      this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
      this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
    }

    Position.prepare();
    Droppables.show(Draggables._lastPointer, this.element);
    Draggables.notify('onDrag', this);
    if (this._isScrollChild) {
      Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
      Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
      Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
      if (Draggables._lastScrollPointer[0] < 0)
        Draggables._lastScrollPointer[0] = 0;
      if (Draggables._lastScrollPointer[1] < 0)
        Draggables._lastScrollPointer[1] = 0;
      this.draw(Draggables._lastScrollPointer);
    }

    if(this.options.change) this.options.change(this);
  },

  _getWindowScroll: function(w) {
    var T, L, W, H;
    with (w.document) {
      if (w.document.documentElement && documentElement.scrollTop) {
        T = documentElement.scrollTop;
        L = documentElement.scrollLeft;
      } else if (w.document.body) {
        T = body.scrollTop;
        L = body.scrollLeft;
      }
      if (w.innerWidth) {
        W = w.innerWidth;
        H = w.innerHeight;
      } else if (w.document.documentElement && documentElement.clientWidth) {
        W = documentElement.clientWidth;
        H = documentElement.clientHeight;
      } else {
        W = body.offsetWidth;
        H = body.offsetHeight;
      }
    }
    return { top: T, left: L, width: W, height: H };
  }
});

Draggable._dragging = { };

/*--------------------------------------------------------------------------*/

var SortableObserver = Class.create({
  initialize: function(element, observer) {
    this.element   = $(element);
    this.observer  = observer;
    this.lastValue = Sortable.serialize(this.element);
  },

  onStart: function() {
    this.lastValue = Sortable.serialize(this.element);
  },

  onEnd: function() {
    Sortable.unmark();
    if(this.lastValue != Sortable.serialize(this.element))
      this.observer(this.element)
  }
});

var Sortable = {
  SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,

  sortables: { },

  _findRootElement: function(element) {
    while (element.tagName.toUpperCase() != "BODY") {
      if(element.id && Sortable.sortables[element.id]) return element;
      element = element.parentNode;
    }
  },

  options: function(element) {
    element = Sortable._findRootElement($(element));
    if(!element) return;
    return Sortable.sortables[element.id];
  },

  destroy: function(element){
    element = $(element);
    var s = Sortable.sortables[element.id];

    if(s) {
      Draggables.removeObserver(s.element);
      s.droppables.each(function(d){ Droppables.remove(d) });
      s.draggables.invoke('destroy');

      delete Sortable.sortables[s.element.id];
    }
  },

  create: function(element) {
    element = $(element);
    var options = Object.extend({
      element:     element,
      tag:         'li',       // assumes li children, override with tag: 'tagname'
      dropOnEmpty: false,
      tree:        false,
      treeTag:     'ul',
      overlap:     'vertical', // one of 'vertical', 'horizontal'
      constraint:  'vertical', // one of 'vertical', 'horizontal', false
      containment: element,    // also takes array of elements (or id's); or false
      handle:      false,      // or a CSS class
      only:        false,
      delay:       0,
      hoverclass:  null,
      ghosting:    false,
      quiet:       false,
      scroll:      false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      format:      this.SERIALIZE_RULE,

      // these take arrays of elements or ids and can be
      // used for better initialization performance
      elements:    false,
      handles:     false,

      onChange:    Prototype.emptyFunction,
      onUpdate:    Prototype.emptyFunction
    }, arguments[1] || { });

    // clear any old sortable with same element
    this.destroy(element);

    // build options for the draggables
    var options_for_draggable = {
      revert:      true,
      quiet:       options.quiet,
      scroll:      options.scroll,
      scrollSpeed: options.scrollSpeed,
      scrollSensitivity: options.scrollSensitivity,
      delay:       options.delay,
      ghosting:    options.ghosting,
      constraint:  options.constraint,
      handle:      options.handle };

    if(options.starteffect)
      options_for_draggable.starteffect = options.starteffect;

    if(options.reverteffect)
      options_for_draggable.reverteffect = options.reverteffect;
    else
      if(options.ghosting) options_for_draggable.reverteffect = function(element) {
        element.style.top  = 0;
        element.style.left = 0;
      };

    if(options.endeffect)
      options_for_draggable.endeffect = options.endeffect;

    if(options.zindex)
      options_for_draggable.zindex = options.zindex;

    // build options for the droppables
    var options_for_droppable = {
      overlap:     options.overlap,
      containment: options.containment,
      tree:        options.tree,
      hoverclass:  options.hoverclass,
      onHover:     Sortable.onHover
    };

    var options_for_tree = {
      onHover:      Sortable.onEmptyHover,
      overlap:      options.overlap,
      containment:  options.containment,
      hoverclass:   options.hoverclass
    };

    // fix for gecko engine
    Element.cleanWhitespace(element);

    options.draggables = [];
    options.droppables = [];

    // drop on empty handling
    if(options.dropOnEmpty || options.tree) {
      Droppables.add(element, options_for_tree);
      options.droppables.push(element);
    }

    (options.elements || this.findElements(element, options) || []).each( function(e,i) {
      var handle = options.handles ? $(options.handles[i]) :
        (options.handle ? $(e).select('.' + options.handle)[0] : e);
      options.draggables.push(
        new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
      Droppables.add(e, options_for_droppable);
      if(options.tree) e.treeNode = element;
      options.droppables.push(e);
    });

    if(options.tree) {
      (Sortable.findTreeElements(element, options) || []).each( function(e) {
        Droppables.add(e, options_for_tree);
        e.treeNode = element;
        options.droppables.push(e);
      });
    }

    // keep reference
    this.sortables[element.id] = options;

    // for onupdate
    Draggables.addObserver(new SortableObserver(element, options.onUpdate));

  },

  // return all suitable-for-sortable elements in a guaranteed order
  findElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.tag);
  },

  findTreeElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.treeTag);
  },

  onHover: function(element, dropon, overlap) {
    if(Element.isParent(dropon, element)) return;

    if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
      return;
    } else if(overlap>0.5) {
      Sortable.mark(dropon, 'before');
      if(dropon.previousSibling != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, dropon);
        if(dropon.parentNode!=oldParentNode)
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    } else {
      Sortable.mark(dropon, 'after');
      var nextElement = dropon.nextSibling || null;
      if(nextElement != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, nextElement);
        if(dropon.parentNode!=oldParentNode)
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    }
  },

  onEmptyHover: function(element, dropon, overlap) {
    var oldParentNode = element.parentNode;
    var droponOptions = Sortable.options(dropon);

    if(!Element.isParent(dropon, element)) {
      var index;

      var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
      var child = null;

      if(children) {
        var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);

        for (index = 0; index < children.length; index += 1) {
          if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
            offset -= Element.offsetSize (children[index], droponOptions.overlap);
          } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
            child = index + 1 < children.length ? children[index + 1] : null;
            break;
          } else {
            child = children[index];
            break;
          }
        }
      }

      dropon.insertBefore(element, child);

      Sortable.options(oldParentNode).onChange(element);
      droponOptions.onChange(element);
    }
  },

  unmark: function() {
    if(Sortable._marker) Sortable._marker.hide();
  },

  mark: function(dropon, position) {
    // mark on ghosting only
    var sortable = Sortable.options(dropon.parentNode);
    if(sortable && !sortable.ghosting) return;

    if(!Sortable._marker) {
      Sortable._marker =
        ($('dropmarker') || Element.extend(document.createElement('DIV'))).
          hide().addClassName('dropmarker').setStyle({position:'absolute'});
      document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
    }
    var offsets = Position.cumulativeOffset(dropon);
    Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});

    if(position=='after')
      if(sortable.overlap == 'horizontal')
        Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
      else
        Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});

    Sortable._marker.show();
  },

  _tree: function(element, options, parent) {
    var children = Sortable.findElements(element, options) || [];

    for (var i = 0; i < children.length; ++i) {
      var match = children[i].id.match(options.format);

      if (!match) continue;

      var child = {
        id: encodeURIComponent(match ? match[1] : null),
        element: element,
        parent: parent,
        children: [],
        position: parent.children.length,
        container: $(children[i]).down(options.treeTag)
      };

      /* Get the element containing the children and recurse over it */
      if (child.container)
        this._tree(child.container, options, child);

      parent.children.push (child);
    }

    return parent;
  },

  tree: function(element) {
    element = $(element);
    var sortableOptions = this.options(element);
    var options = Object.extend({
      tag: sortableOptions.tag,
      treeTag: sortableOptions.treeTag,
      only: sortableOptions.only,
      name: element.id,
      format: sortableOptions.format
    }, arguments[1] || { });

    var root = {
      id: null,
      parent: null,
      children: [],
      container: element,
      position: 0
    };

    return Sortable._tree(element, options, root);
  },

  /* Construct a [i] index for a particular node */
  _constructIndex: function(node) {
    var index = '';
    do {
      if (node.id) index = '[' + node.position + ']' + index;
    } while ((node = node.parent) != null);
    return index;
  },

  sequence: function(element) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[1] || { });

    return $(this.findElements(element, options) || []).map( function(item) {
      return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
    });
  },

  setSequence: function(element, new_sequence) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[2] || { });

    var nodeMap = { };
    this.findElements(element, options).each( function(n) {
        if (n.id.match(options.format))
            nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
        n.parentNode.removeChild(n);
    });

    new_sequence.each(function(ident) {
      var n = nodeMap[ident];
      if (n) {
        n[1].appendChild(n[0]);
        delete nodeMap[ident];
      }
    });
  },

  serialize: function(element) {
    element = $(element);
    var options = Object.extend(Sortable.options(element), arguments[1] || { });
    var name = encodeURIComponent(
      (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);

    if (options.tree) {
      return Sortable.tree(element, arguments[1]).children.map( function (item) {
        return [name + Sortable._constructIndex(item) + "[id]=" +
                encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
      }).flatten().join('&');
    } else {
      return Sortable.sequence(element, arguments[1]).map( function(item) {
        return name + "[]=" + encodeURIComponent(item);
      }).join('&');
    }
  }
};

// Returns true if child is contained within element
Element.isParent = function(child, element) {
  if (!child.parentNode || child == element) return false;
  if (child.parentNode == element) return true;
  return Element.isParent(child.parentNode, element);
};

Element.findChildren = function(element, only, recursive, tagName) {
  if(!element.hasChildNodes()) return null;
  tagName = tagName.toUpperCase();
  if(only) only = [only].flatten();
  var elements = [];
  $A(element.childNodes).each( function(e) {
    if(e.tagName && e.tagName.toUpperCase()==tagName &&
      (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
        elements.push(e);
    if(recursive) {
      var grandchildren = Element.findChildren(e, only, recursive, tagName);
      if(grandchildren) elements.push(grandchildren);
    }
  });

  return (elements.length>0 ? elements.flatten() : []);
};

Element.offsetSize = function (element, type) {
  return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
};

// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2008 Ivan Krstic (http://blogs.law.harvard.edu/ivan)
//           (c) 2005-2008 Jon Tirsen (http://www.tirsen.com)
// Contributors:
//  Richard Livsey
//  Rahul Bhargava
//  Rob Wills
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

// Autocompleter.Base handles all the autocompletion functionality
// that's independent of the data source for autocompletion. This
// includes drawing the autocompletion menu, observing keyboard
// and mouse events, and similar.
//
// Specific autocompleters need to provide, at the very least,
// a getUpdatedChoices function that will be invoked every time
// the text inside the monitored textbox changes. This method
// should get the text for which to provide autocompletion by
// invoking this.getToken(), NOT by directly accessing
// this.element.value. This is to allow incremental tokenized
// autocompletion. Specific auto-completion logic (AJAX, etc)
// belongs in getUpdatedChoices.
//
// Tokenized incremental autocompletion is enabled automatically
// when an autocompleter is instantiated with the 'tokens' option
// in the options parameter, e.g.:
// new Ajax.Autocompleter('id','upd', '/url/', { tokens: ',' });
// will incrementally autocomplete with a comma as the token.
// Additionally, ',' in the above example can be replaced with
// a token array, e.g. { tokens: [',', '\n'] } which
// enables autocompletion on multiple tokens. This is most
// useful when one of the tokens is \n (a newline), as it
// allows smart autocompletion after linebreaks.

if(typeof Effect == 'undefined')
  throw("controls.js requires including script.aculo.us' effects.js library");

var Autocompleter = { };
Autocompleter.Base = Class.create({
  baseInitialize: function(element, update, options) {
    element          = $(element);
    this.element     = element;
    this.update      = $(update);
    this.hasFocus    = false;
    this.changed     = false;
    this.active      = false;
    this.index       = 0;
    this.entryCount  = 0;
    this.oldElementValue = this.element.value;

    if(this.setOptions)
      this.setOptions(options);
    else
      this.options = options || { };

    this.options.paramName    = this.options.paramName || this.element.name;
    this.options.tokens       = this.options.tokens || [];
    this.options.frequency    = this.options.frequency || 0.4;
    this.options.minChars     = this.options.minChars || 1;
    this.options.onShow       = this.options.onShow ||
      function(element, update){
        if(!update.style.position || update.style.position=='absolute') {
          update.style.position = 'absolute';
          Position.clone(element, update, {
            setHeight: false,
            offsetTop: element.offsetHeight
          });
        }
        Effect.Appear(update,{duration:0.15});
      };
    this.options.onHide = this.options.onHide ||
      function(element, update){ new Effect.Fade(update,{duration:0.15}) };

    if(typeof(this.options.tokens) == 'string')
      this.options.tokens = new Array(this.options.tokens);
    // Force carriage returns as token delimiters anyway
    if (!this.options.tokens.include('\n'))
      this.options.tokens.push('\n');

    this.observer = null;

    this.element.setAttribute('autocomplete','off');

    Element.hide(this.update);

    Event.observe(this.element, 'blur', this.onBlur.bindAsEventListener(this));
    Event.observe(this.element, 'keydown', this.onKeyPress.bindAsEventListener(this));
  },

  show: function() {
    if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
    if(!this.iefix &&
      (Prototype.Browser.IE) &&
      (Element.getStyle(this.update, 'position')=='absolute')) {
      new Insertion.After(this.update,
       '<iframe id="' + this.update.id + '_iefix" '+
       'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
       'src="javascript:false;" frameborder="0" scrolling="no"></iframe>');
      this.iefix = $(this.update.id+'_iefix');
    }
    if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50);
  },

  fixIEOverlapping: function() {
    Position.clone(this.update, this.iefix, {setTop:(!this.update.style.height)});
    this.iefix.style.zIndex = 1;
    this.update.style.zIndex = 2;
    Element.show(this.iefix);
  },

  hide: function() {
    this.stopIndicator();
    if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update);
    if(this.iefix) Element.hide(this.iefix);
  },

  startIndicator: function() {
    if(this.options.indicator) Element.show(this.options.indicator);
  },

  stopIndicator: function() {
    if(this.options.indicator) Element.hide(this.options.indicator);
  },

  onKeyPress: function(event) {
    if(this.active)
      switch(event.keyCode) {
       case Event.KEY_TAB:
       case Event.KEY_RETURN:
         this.selectEntry();
         Event.stop(event);
       case Event.KEY_ESC:
         this.hide();
         this.active = false;
         Event.stop(event);
         return;
       case Event.KEY_LEFT:
       case Event.KEY_RIGHT:
         return;
       case Event.KEY_UP:
         this.markPrevious();
         this.render();
         Event.stop(event);
         return;
       case Event.KEY_DOWN:
         this.markNext();
         this.render();
         Event.stop(event);
         return;
      }
     else
       if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN ||
         (Prototype.Browser.WebKit > 0 && event.keyCode == 0)) return;

    this.changed = true;
    this.hasFocus = true;

    if(this.observer) clearTimeout(this.observer);
      this.observer =
        setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);
  },

  activate: function() {
    this.changed = false;
    this.hasFocus = true;
    this.getUpdatedChoices();
  },

  onHover: function(event) {
    var element = Event.findElement(event, 'LI');
    if(this.index != element.autocompleteIndex)
    {
        this.index = element.autocompleteIndex;
        this.render();
    }
    Event.stop(event);
  },

  onClick: function(event) {
    var element = Event.findElement(event, 'LI');
    this.index = element.autocompleteIndex;
    this.selectEntry();
    this.hide();
  },

  onBlur: function(event) {
    // needed to make click events working
    setTimeout(this.hide.bind(this), 250);
    this.hasFocus = false;
    this.active = false;
  },

  render: function() {
    if(this.entryCount > 0) {
      for (var i = 0; i < this.entryCount; i++)
        this.index==i ?
          Element.addClassName(this.getEntry(i),"selected") :
          Element.removeClassName(this.getEntry(i),"selected");
      if(this.hasFocus) {
        this.show();
        this.active = true;
      }
    } else {
      this.active = false;
      this.hide();
    }
  },

  markPrevious: function() {
    if(this.index > 0) this.index--;
      else this.index = this.entryCount-1;
    this.getEntry(this.index).scrollIntoView(true);
  },

  markNext: function() {
    if(this.index < this.entryCount-1) this.index++;
      else this.index = 0;
    this.getEntry(this.index).scrollIntoView(false);
  },

  getEntry: function(index) {
    return this.update.firstChild.childNodes[index];
  },

  getCurrentEntry: function() {
    return this.getEntry(this.index);
  },

  selectEntry: function() {
    this.active = false;
    this.updateElement(this.getCurrentEntry());
  },

  updateElement: function(selectedElement) {
    if (this.options.updateElement) {
      this.options.updateElement(selectedElement);
      return;
    }
    var value = '';
    if (this.options.select) {
      var nodes = $(selectedElement).select('.' + this.options.select) || [];
      if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select);
    } else
      value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal');

    var bounds = this.getTokenBounds();
    if (bounds[0] != -1) {
      var newValue = this.element.value.substr(0, bounds[0]);
      var whitespace = this.element.value.substr(bounds[0]).match(/^\s+/);
      if (whitespace)
        newValue += whitespace[0];
      this.element.value = newValue + value + this.element.value.substr(bounds[1]);
    } else {
      this.element.value = value;
    }
    this.oldElementValue = this.element.value;
    this.element.focus();

    if (this.options.afterUpdateElement)
      this.options.afterUpdateElement(this.element, selectedElement);
  },

  updateChoices: function(choices) {
    if(!this.changed && this.hasFocus) {
      this.update.innerHTML = choices;
      Element.cleanWhitespace(this.update);
      Element.cleanWhitespace(this.update.down());

      if(this.update.firstChild && this.update.down().childNodes) {
        this.entryCount =
          this.update.down().childNodes.length;
        for (var i = 0; i < this.entryCount; i++) {
          var entry = this.getEntry(i);
          entry.autocompleteIndex = i;
          this.addObservers(entry);
        }
      } else {
        this.entryCount = 0;
      }

      this.stopIndicator();
      this.index = 0;

      if(this.entryCount==1 && this.options.autoSelect) {
        this.selectEntry();
        this.hide();
      } else {
        this.render();
      }
    }
  },

  addObservers: function(element) {
    Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));
    Event.observe(element, "click", this.onClick.bindAsEventListener(this));
  },

  onObserverEvent: function() {
    this.changed = false;
    this.tokenBounds = null;
    if(this.getToken().length>=this.options.minChars) {
      this.getUpdatedChoices();
    } else {
      this.active = false;
      this.hide();
    }
    this.oldElementValue = this.element.value;
  },

  getToken: function() {
    var bounds = this.getTokenBounds();
    return this.element.value.substring(bounds[0], bounds[1]).strip();
  },

  getTokenBounds: function() {
    if (null != this.tokenBounds) return this.tokenBounds;
    var value = this.element.value;
    if (value.strip().empty()) return [-1, 0];
    var diff = arguments.callee.getFirstDifferencePos(value, this.oldElementValue);
    var offset = (diff == this.oldElementValue.length ? 1 : 0);
    var prevTokenPos = -1, nextTokenPos = value.length;
    var tp;
    for (var index = 0, l = this.options.tokens.length; index < l; ++index) {
      tp = value.lastIndexOf(this.options.tokens[index], diff + offset - 1);
      if (tp > prevTokenPos) prevTokenPos = tp;
      tp = value.indexOf(this.options.tokens[index], diff + offset);
      if (-1 != tp && tp < nextTokenPos) nextTokenPos = tp;
    }
    return (this.tokenBounds = [prevTokenPos + 1, nextTokenPos]);
  }
});

Autocompleter.Base.prototype.getTokenBounds.getFirstDifferencePos = function(newS, oldS) {
  var boundary = Math.min(newS.length, oldS.length);
  for (var index = 0; index < boundary; ++index)
    if (newS[index] != oldS[index])
      return index;
  return boundary;
};

Ajax.Autocompleter = Class.create(Autocompleter.Base, {
  initialize: function(element, update, url, options) {
    this.baseInitialize(element, update, options);
    this.options.asynchronous  = true;
    this.options.onComplete    = this.onComplete.bind(this);
    this.options.defaultParams = this.options.parameters || null;
    this.url                   = url;
  },

  getUpdatedChoices: function() {
    this.startIndicator();

    var entry = encodeURIComponent(this.options.paramName) + '=' +
      encodeURIComponent(this.getToken());

    this.options.parameters = this.options.callback ?
      this.options.callback(this.element, entry) : entry;

    if(this.options.defaultParams)
      this.options.parameters += '&' + this.options.defaultParams;

    new Ajax.Request(this.url, this.options);
  },

  onComplete: function(request) {
    this.updateChoices(request.responseText);
  }
});

// The local array autocompleter. Used when you'd prefer to
// inject an array of autocompletion options into the page, rather
// than sending out Ajax queries, which can be quite slow sometimes.
//
// The constructor takes four parameters. The first two are, as usual,
// the id of the monitored textbox, and id of the autocompletion menu.
// The third is the array you want to autocomplete from, and the fourth
// is the options block.
//
// Extra local autocompletion options:
// - choices - How many autocompletion choices to offer
//
// - partialSearch - If false, the autocompleter will match entered
//                    text only at the beginning of strings in the
//                    autocomplete array. Defaults to true, which will
//                    match text at the beginning of any *word* in the
//                    strings in the autocomplete array. If you want to
//                    search anywhere in the string, additionally set
//                    the option fullSearch to true (default: off).
//
// - fullSsearch - Search anywhere in autocomplete array strings.
//
// - partialChars - How many characters to enter before triggering
//                   a partial match (unlike minChars, which defines
//                   how many characters are required to do any match
//                   at all). Defaults to 2.
//
// - ignoreCase - Whether to ignore case when autocompleting.
//                 Defaults to true.
//
// It's possible to pass in a custom function as the 'selector'
// option, if you prefer to write your own autocompletion logic.
// In that case, the other options above will not apply unless
// you support them.

Autocompleter.Local = Class.create(Autocompleter.Base, {
  initialize: function(element, update, array, options) {
    this.baseInitialize(element, update, options);
    this.options.array = array;
  },

  getUpdatedChoices: function() {
    this.updateChoices(this.options.selector(this));
  },

  setOptions: function(options) {
    this.options = Object.extend({
      choices: 10,
      partialSearch: true,
      partialChars: 2,
      ignoreCase: true,
      fullSearch: false,
      selector: function(instance) {
        var ret       = []; // Beginning matches
        var partial   = []; // Inside matches
        var entry     = instance.getToken();
        var count     = 0;

        for (var i = 0; i < instance.options.array.length &&
          ret.length < instance.options.choices ; i++) {

          var elem = instance.options.array[i];
          var foundPos = instance.options.ignoreCase ?
            elem.toLowerCase().indexOf(entry.toLowerCase()) :
            elem.indexOf(entry);

          while (foundPos != -1) {
            if (foundPos == 0 && elem.length != entry.length) {
              ret.push("<li><strong>" + elem.substr(0, entry.length) + "</strong>" +
                elem.substr(entry.length) + "</li>");
              break;
            } else if (entry.length >= instance.options.partialChars &&
              instance.options.partialSearch && foundPos != -1) {
              if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {
                partial.push("<li>" + elem.substr(0, foundPos) + "<strong>" +
                  elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(
                  foundPos + entry.length) + "</li>");
                break;
              }
            }

            foundPos = instance.options.ignoreCase ?
              elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) :
              elem.indexOf(entry, foundPos + 1);

          }
        }
        if (partial.length)
          ret = ret.concat(partial.slice(0, instance.options.choices - ret.length));
        return "<ul>" + ret.join('') + "</ul>";
      }
    }, options || { });
  }
});

// AJAX in-place editor and collection editor
// Full rewrite by Christophe Porteneuve <tdd@tddsworld.com> (April 2007).

// Use this if you notice weird scrolling problems on some browsers,
// the DOM might be a bit confused when this gets called so do this
// waits 1 ms (with setTimeout) until it does the activation
Field.scrollFreeActivate = function(field) {
  setTimeout(function() {
    Field.activate(field);
  }, 1);
};

Ajax.InPlaceEditor = Class.create({
  initialize: function(element, url, options) {
    this.url = url;
    this.element = element = $(element);
    this.prepareOptions();
    this._controls = { };
    arguments.callee.dealWithDeprecatedOptions(options); // DEPRECATION LAYER!!!
    Object.extend(this.options, options || { });
    if (!this.options.formId && this.element.id) {
      this.options.formId = this.element.id + '-inplaceeditor';
      if ($(this.options.formId))
        this.options.formId = '';
    }
    if (this.options.externalControl)
      this.options.externalControl = $(this.options.externalControl);
    if (!this.options.externalControl)
      this.options.externalControlOnly = false;
    this._originalBackground = this.element.getStyle('background-color') || 'transparent';
    this.element.title = this.options.clickToEditText;
    this._boundCancelHandler = this.handleFormCancellation.bind(this);
    this._boundComplete = (this.options.onComplete || Prototype.emptyFunction).bind(this);
    this._boundFailureHandler = this.handleAJAXFailure.bind(this);
    this._boundSubmitHandler = this.handleFormSubmission.bind(this);
    this._boundWrapperHandler = this.wrapUp.bind(this);
    this.registerListeners();
  },
  checkForEscapeOrReturn: function(e) {
    if (!this._editing || e.ctrlKey || e.altKey || e.shiftKey) return;
    if (Event.KEY_ESC == e.keyCode)
      this.handleFormCancellation(e);
    else if (Event.KEY_RETURN == e.keyCode)
      this.handleFormSubmission(e);
  },
  createControl: function(mode, handler, extraClasses) {
    var control = this.options[mode + 'Control'];
    var text = this.options[mode + 'Text'];
    if ('button' == control) {
      var btn = document.createElement('input');
      btn.type = 'submit';
      btn.value = text;
      btn.className = 'editor_' + mode + '_button';
      if ('cancel' == mode)
        btn.onclick = this._boundCancelHandler;
      this._form.appendChild(btn);
      this._controls[mode] = btn;
    } else if ('link' == control) {
      var link = document.createElement('a');
      link.href = '#';
      link.appendChild(document.createTextNode(text));
      link.onclick = 'cancel' == mode ? this._boundCancelHandler : this._boundSubmitHandler;
      link.className = 'editor_' + mode + '_link';
      if (extraClasses)
        link.className += ' ' + extraClasses;
      this._form.appendChild(link);
      this._controls[mode] = link;
    }
  },
  createEditField: function() {
    var text = (this.options.loadTextURL ? this.options.loadingText : this.getText());
    var fld;
    if (1 >= this.options.rows && !/\r|\n/.test(this.getText())) {
      fld = document.createElement('input');
      fld.type = 'text';
      var size = this.options.size || this.options.cols || 0;
      if (0 < size) fld.size = size;
    } else {
      fld = document.createElement('textarea');
      fld.rows = (1 >= this.options.rows ? this.options.autoRows : this.options.rows);
      fld.cols = this.options.cols || 40;
    }
    fld.name = this.options.paramName;
    fld.value = text; // No HTML breaks conversion anymore
    fld.className = 'editor_field';
    if (this.options.submitOnBlur)
      fld.onblur = this._boundSubmitHandler;
    this._controls.editor = fld;
    if (this.options.loadTextURL)
      this.loadExternalText();
    this._form.appendChild(this._controls.editor);
  },
  createForm: function() {
    var ipe = this;
    function addText(mode, condition) {
      var text = ipe.options['text' + mode + 'Controls'];
      if (!text || condition === false) return;
      ipe._form.appendChild(document.createTextNode(text));
    };
    this._form = $(document.createElement('form'));
    this._form.id = this.options.formId;
    this._form.addClassName(this.options.formClassName);
    this._form.onsubmit = this._boundSubmitHandler;
    this.createEditField();
    if ('textarea' == this._controls.editor.tagName.toLowerCase())
      this._form.appendChild(document.createElement('br'));
    if (this.options.onFormCustomization)
      this.options.onFormCustomization(this, this._form);
    addText('Before', this.options.okControl || this.options.cancelControl);
    this.createControl('ok', this._boundSubmitHandler);
    addText('Between', this.options.okControl && this.options.cancelControl);
    this.createControl('cancel', this._boundCancelHandler, 'editor_cancel');
    addText('After', this.options.okControl || this.options.cancelControl);
  },
  destroy: function() {
    if (this._oldInnerHTML)
      this.element.innerHTML = this._oldInnerHTML;
    this.leaveEditMode();
    this.unregisterListeners();
  },
  enterEditMode: function(e) {
    if (this._saving || this._editing) return;
    this._editing = true;
    this.triggerCallback('onEnterEditMode');
    if (this.options.externalControl)
      this.options.externalControl.hide();
    this.element.hide();
    this.createForm();
    this.element.parentNode.insertBefore(this._form, this.element);
    if (!this.options.loadTextURL)
      this.postProcessEditField();
    if (e) Event.stop(e);
  },
  enterHover: function(e) {
    if (this.options.hoverClassName)
      this.element.addClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onEnterHover');
  },
  getText: function() {
    return this.element.innerHTML.unescapeHTML();
  },
  handleAJAXFailure: function(transport) {
    this.triggerCallback('onFailure', transport);
    if (this._oldInnerHTML) {
      this.element.innerHTML = this._oldInnerHTML;
      this._oldInnerHTML = null;
    }
  },
  handleFormCancellation: function(e) {
    this.wrapUp();
    if (e) Event.stop(e);
  },
  handleFormSubmission: function(e) {
    var form = this._form;
    var value = $F(this._controls.editor);
    this.prepareSubmission();
    var params = this.options.callback(form, value) || '';
    if (Object.isString(params))
      params = params.toQueryParams();
    params.editorId = this.element.id;
    if (this.options.htmlResponse) {
      var options = Object.extend({ evalScripts: true }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Updater({ success: this.element }, this.url, options);
    } else {
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Request(this.url, options);
    }
    if (e) Event.stop(e);
  },
  leaveEditMode: function() {
    this.element.removeClassName(this.options.savingClassName);
    this.removeForm();
    this.leaveHover();
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
    if (this.options.externalControl)
      this.options.externalControl.show();
    this._saving = false;
    this._editing = false;
    this._oldInnerHTML = null;
    this.triggerCallback('onLeaveEditMode');
  },
  leaveHover: function(e) {
    if (this.options.hoverClassName)
      this.element.removeClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onLeaveHover');
  },
  loadExternalText: function() {
    this._form.addClassName(this.options.loadingClassName);
    this._controls.editor.disabled = true;
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._form.removeClassName(this.options.loadingClassName);
        var text = transport.responseText;
        if (this.options.stripLoadedTextTags)
          text = text.stripTags();
        this._controls.editor.value = text;
        this._controls.editor.disabled = false;
        this.postProcessEditField();
      }.bind(this),
      onFailure: this._boundFailureHandler
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },
  postProcessEditField: function() {
    var fpc = this.options.fieldPostCreation;
    if (fpc)
      $(this._controls.editor)['focus' == fpc ? 'focus' : 'activate']();
  },
  prepareOptions: function() {
    this.options = Object.clone(Ajax.InPlaceEditor.DefaultOptions);
    Object.extend(this.options, Ajax.InPlaceEditor.DefaultCallbacks);
    [this._extraDefaultOptions].flatten().compact().each(function(defs) {
      Object.extend(this.options, defs);
    }.bind(this));
  },
  prepareSubmission: function() {
    this._saving = true;
    this.removeForm();
    this.leaveHover();
    this.showSaving();
  },
  registerListeners: function() {
    this._listeners = { };
    var listener;
    $H(Ajax.InPlaceEditor.Listeners).each(function(pair) {
      listener = this[pair.value].bind(this);
      this._listeners[pair.key] = listener;
      if (!this.options.externalControlOnly)
        this.element.observe(pair.key, listener);
      if (this.options.externalControl)
        this.options.externalControl.observe(pair.key, listener);
    }.bind(this));
  },
  removeForm: function() {
    if (!this._form) return;
    this._form.remove();
    this._form = null;
    this._controls = { };
  },
  showSaving: function() {
    this._oldInnerHTML = this.element.innerHTML;
    this.element.innerHTML = this.options.savingText;
    this.element.addClassName(this.options.savingClassName);
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
  },
  triggerCallback: function(cbName, arg) {
    if ('function' == typeof this.options[cbName]) {
      this.options[cbName](this, arg);
    }
  },
  unregisterListeners: function() {
    $H(this._listeners).each(function(pair) {
      if (!this.options.externalControlOnly)
        this.element.stopObserving(pair.key, pair.value);
      if (this.options.externalControl)
        this.options.externalControl.stopObserving(pair.key, pair.value);
    }.bind(this));
  },
  wrapUp: function(transport) {
    this.leaveEditMode();
    // Can't use triggerCallback due to backward compatibility: requires
    // binding + direct element
    this._boundComplete(transport, this.element);
  }
});

Object.extend(Ajax.InPlaceEditor.prototype, {
  dispose: Ajax.InPlaceEditor.prototype.destroy
});

Ajax.InPlaceCollectionEditor = Class.create(Ajax.InPlaceEditor, {
  initialize: function($super, element, url, options) {
    this._extraDefaultOptions = Ajax.InPlaceCollectionEditor.DefaultOptions;
    $super(element, url, options);
  },

  createEditField: function() {
    var list = document.createElement('select');
    list.name = this.options.paramName;
    list.size = 1;
    this._controls.editor = list;
    this._collection = this.options.collection || [];
    if (this.options.loadCollectionURL)
      this.loadCollection();
    else
      this.checkForExternalText();
    this._form.appendChild(this._controls.editor);
  },

  loadCollection: function() {
    this._form.addClassName(this.options.loadingClassName);
    this.showLoadingText(this.options.loadingCollectionText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        var js = transport.responseText.strip();
        if (!/^\[.*\]$/.test(js)) // TODO: improve sanity check
          throw('Server returned an invalid collection representation.');
        this._collection = eval(js);
        this.checkForExternalText();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadCollectionURL, options);
  },

  showLoadingText: function(text) {
    this._controls.editor.disabled = true;
    var tempOption = this._controls.editor.firstChild;
    if (!tempOption) {
      tempOption = document.createElement('option');
      tempOption.value = '';
      this._controls.editor.appendChild(tempOption);
      tempOption.selected = true;
    }
    tempOption.update((text || '').stripScripts().stripTags());
  },

  checkForExternalText: function() {
    this._text = this.getText();
    if (this.options.loadTextURL)
      this.loadExternalText();
    else
      this.buildOptionList();
  },

  loadExternalText: function() {
    this.showLoadingText(this.options.loadingText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._text = transport.responseText.strip();
        this.buildOptionList();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },

  buildOptionList: function() {
    this._form.removeClassName(this.options.loadingClassName);
    this._collection = this._collection.map(function(entry) {
      return 2 === entry.length ? entry : [entry, entry].flatten();
    });
    var marker = ('value' in this.options) ? this.options.value : this._text;
    var textFound = this._collection.any(function(entry) {
      return entry[0] == marker;
    }.bind(this));
    this._controls.editor.update('');
    var option;
    this._collection.each(function(entry, index) {
      option = document.createElement('option');
      option.value = entry[0];
      option.selected = textFound ? entry[0] == marker : 0 == index;
      option.appendChild(document.createTextNode(entry[1]));
      this._controls.editor.appendChild(option);
    }.bind(this));
    this._controls.editor.disabled = false;
    Field.scrollFreeActivate(this._controls.editor);
  }
});

//**** DEPRECATION LAYER FOR InPlace[Collection]Editor! ****
//**** This only  exists for a while,  in order to  let ****
//**** users adapt to  the new API.  Read up on the new ****
//**** API and convert your code to it ASAP!            ****

Ajax.InPlaceEditor.prototype.initialize.dealWithDeprecatedOptions = function(options) {
  if (!options) return;
  function fallback(name, expr) {
    if (name in options || expr === undefined) return;
    options[name] = expr;
  };
  fallback('cancelControl', (options.cancelLink ? 'link' : (options.cancelButton ? 'button' :
    options.cancelLink == options.cancelButton == false ? false : undefined)));
  fallback('okControl', (options.okLink ? 'link' : (options.okButton ? 'button' :
    options.okLink == options.okButton == false ? false : undefined)));
  fallback('highlightColor', options.highlightcolor);
  fallback('highlightEndColor', options.highlightendcolor);
};

Object.extend(Ajax.InPlaceEditor, {
  DefaultOptions: {
    ajaxOptions: { },
    autoRows: 3,                                // Use when multi-line w/ rows == 1
    cancelControl: 'link',                      // 'link'|'button'|false
    cancelText: 'cancel',
    clickToEditText: 'Click to edit',
    externalControl: null,                      // id|elt
    externalControlOnly: false,
    fieldPostCreation: 'activate',              // 'activate'|'focus'|false
    formClassName: 'inplaceeditor-form',
    formId: null,                               // id|elt
    highlightColor: '#ffff99',
    highlightEndColor: '#ffffff',
    hoverClassName: '',
    htmlResponse: true,
    loadingClassName: 'inplaceeditor-loading',
    loadingText: 'Loading...',
    okControl: 'button',                        // 'link'|'button'|false
    okText: 'ok',
    paramName: 'value',
    rows: 1,                                    // If 1 and multi-line, uses autoRows
    savingClassName: 'inplaceeditor-saving',
    savingText: 'Saving...',
    size: 0,
    stripLoadedTextTags: false,
    submitOnBlur: false,
    textAfterControls: '',
    textBeforeControls: '',
    textBetweenControls: ''
  },
  DefaultCallbacks: {
    callback: function(form) {
      return Form.serialize(form);
    },
    onComplete: function(transport, element) {
      // For backward compatibility, this one is bound to the IPE, and passes
      // the element directly.  It was too often customized, so we don't break it.
      new Effect.Highlight(element, {
        startcolor: this.options.highlightColor, keepBackgroundImage: true });
    },
    onEnterEditMode: null,
    onEnterHover: function(ipe) {
      ipe.element.style.backgroundColor = ipe.options.highlightColor;
      if (ipe._effect)
        ipe._effect.cancel();
    },
    onFailure: function(transport, ipe) {
      alert('Error communication with the server: ' + transport.responseText.stripTags());
    },
    onFormCustomization: null, // Takes the IPE and its generated form, after editor, before controls.
    onLeaveEditMode: null,
    onLeaveHover: function(ipe) {
      ipe._effect = new Effect.Highlight(ipe.element, {
        startcolor: ipe.options.highlightColor, endcolor: ipe.options.highlightEndColor,
        restorecolor: ipe._originalBackground, keepBackgroundImage: true
      });
    }
  },
  Listeners: {
    click: 'enterEditMode',
    keydown: 'checkForEscapeOrReturn',
    mouseover: 'enterHover',
    mouseout: 'leaveHover'
  }
});

Ajax.InPlaceCollectionEditor.DefaultOptions = {
  loadingCollectionText: 'Loading options...'
};

// Delayed observer, like Form.Element.Observer,
// but waits for delay after last key input
// Ideal for live-search fields

Form.Element.DelayedObserver = Class.create({
  initialize: function(element, delay, callback) {
    this.delay     = delay || 0.5;
    this.element   = $(element);
    this.callback  = callback;
    this.timer     = null;
    this.lastValue = $F(this.element);
    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
  },
  delayedListener: function(event) {
    if(this.lastValue == $F(this.element)) return;
    if(this.timer) clearTimeout(this.timer);
    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
    this.lastValue = $F(this.element);
  },
  onTimerEvent: function() {
    this.timer = null;
    this.callback(this.element, $F(this.element));
  }
});

/**
 * @fileoverview Provides a function that can wrap arbitrary DOM elements as
 * buttons with click, mousedown, mousemove, and mouseup handlers.
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision: 910 $
 */

/**
 * Hook up a dom element to act as a button.
 *
 * @param {Object} domElem The dom element to wrap as a button.
 * @param {Function} onclick Function to handle the click event.
 * @param {Function} onmousedown Function to handle the mousedown event.
 * @param {Function} onmousemove Function to handle the mousemove event.
 * @param {Function} onmouseup Function to handle the mouseup event.
 * 
 * @return A reference to the passed in dom element with event handlers attached.
 * @type {Object}
 */
function AttachButtonHandlers(domElem, bind_to, onclick, onmousedown, onmousemove, onmouseup){
 	if (! bind_to) var bind_to = domElem;
    if (domElem){
    	var argPattern = Function.checkArgs(arguments, ['object', 'any', 'any', 'any', 'any']);
    
    	//var retVal = null;
    	//Object.myExtend(domInstance, this);
    	//window.alert('In button initialize');
    
    	//Elem.disableDragDrop(domElem);	
    	if (onclick) Event.myObserve(domElem, 'click', onclick.bindAsEventListener(bind_to));
    	if (onmousedown) Event.myObserve(domElem, 'mousedown', onmousedown.bindAsEventListener(bind_to));
    	if (onmousemove) Event.myObserve(domElem, 'mousemove', onmousemove.bindAsEventListener(bind_to));
    	if (onmouseup) Event.myObserve(domElem, 'mouseup', onmouseup.bindAsEventListener(bind_to));
    	return domElem;	
    }
	else {
		//window.alert('Warning: could not attach button handlers to domElem');
	}
}

/**
 * @fileoverview This file defines a class for an editable text area.
 * @author Jared Donovan
 * @version $LastChangedRevision: 1790 $
 */

function Edit(domInstance){
	var argPattern = Function.checkArgs(arguments, ['undefined'], ['object']);
	var retVal = null;
	
	if (argPattern == 1){
		retVal = this.initialize(domInstance);
	}
	return retVal;
}

Edit.prototype.initialize = function Edit_initialize(domInstance){
	Function.checkArgs(arguments, ['object']);
		
	Object.myExtend(domInstance, this);
	
	domInstance.stiki = null;
	
	domInstance.iframe = $('editIFrame');
	domInstance.content_tabs = $('content_tabs');

	AttachButtonHandlers($('edit_save'), $('edit'),
		this.save_and_close
	);
	
	AttachButtonHandlers($('edit_close'), $('edit'),
		this.close
	);

	AttachButtonHandlers($('bold'), $('edit'),
	   this.make_text_bold
	);

	AttachButtonHandlers($('italic'), $('edit'),
	   this.make_text_italic
	);
	
	Event.myObserve(domInstance, 'click', 
		function(e){
			if (!e) var e = window.event; 
			e.cancelBubble = true;
		}.bindAsEventListener(domInstance)
	);
	return domInstance;
}

Edit.prototype.open = function Edit_open(contents)
{
	Function.checkArgs(arguments, ['object']);
	
	this.contents = contents;

	// Add a tab for each piece of content.
	for (var i = 0; i < contents.length; i++){
		this.add_tab(i);
	}
	
	var inner_HTML = (contents[0].get_html() || ' ');

	Elem.classRemove(this, 'hidden');
	
	function reapplyInnerHTML(ifm, inner_HTML){
		if (ifm 
			&& ifm.contentWindow 
			&& ifm.contentWindow.document 
			&& ifm.contentWindow.document.readyState == 'complete')
			{	
			ifm.contentWindow.document.body.innerHTML = inner_HTML;
			for (k in ifm_style){
				ifm.contentWindow.document.body.style[k] = ifm_style[k];		
			}
			Event.myObserve(ifm.contentWindow.document, 'keypress', 
				function(){app.edit.watch_escape(window.event);});
			ifm.contentWindow.focus();
		}
	};	
	
	var ifm = this.iframe;
	var ifm_style = {
		fontFamily: 'Arial, Helvetica, sans-serif',
		fontSize: '14pt'
	}
	
	this.iframe.contentWindow.document.body.innerHTML = inner_HTML;
	for (k in ifm_style){
		this.iframe.contentWindow.document.body.style[k] = ifm_style[k];		
	}
	if (this.iframe.contentWindow.addEventListener){
		this.iframe.contentWindow.addEventListener('keypress', 
			this.watch_escape.bindAsEventListener(this), false);
	}
	this.iframe.contentWindow.focus();
	this.iframe.contentWindow.document.designMode = 'on';
	// Do not style with CSS (Moz only).
    try {
        this.iframe.contentWindow.document.execCommand("styleWithCSS", false, false);	    
    }catch(e){
        // IE6 throws an 'invalid argument error.'
    }
	this.iframe.contentWindow.document.onreadystatechange = function(){
		reapplyInnerHTML(ifm, inner_HTML, ifm_style);
	};
	//this.iframe.contentWindow.focus();
	//this.iframe.contentDocument.execCommand("selectall", false, null);
	this.iframe.focus();
	this.iframe.contentWindow.focus();
}

Edit.prototype.watch_escape = function Edit_watch_escape(e)
{
	var e = e || app.edit.iframe.contentWindow.event || window.event;
	if (e.keyCode == 27){
		app.edit.save_and_close();
	}
}

Edit.prototype.save_and_close = function Edit_close_and_save()
{
	if (this.contents){
		var newContent = (app.edit.iframe.contentWindow.document.body.innerHTML || ' ');
		if (typeof(newContent) == "null"){
		  newContent = '';
		}
		this.contents[0].set_html(newContent);
		// TODO: This is a hack to get it to save in Firefox, 
		//		 I have no idea why this is necessary.
		setTimeout('$("' + this.contents[0].id + '").model.update($("' + this.contents[0].id + '"), "EditPane");', 10);
		//app.page.edit.stiki.model.update(app.page.edit.stiki, 'EditPane');
		this.close();
	}
}

Edit.prototype.make_text_bold = function Edit_make_text_bold()
{
	app.edit.iframe.contentWindow.document.execCommand("Bold", false, null);
	this.iframe.contentWindow.focus();
}

Edit.prototype.make_text_italic = function Edit_make_text_italic()
{
	app.edit.iframe.contentWindow.document.execCommand("Italic", false, null);
	this.iframe.contentWindow.focus();
}

/**
 * Add a tab to the edit pane with the specified text.
 * @param {String} link_text
 */ 
Edit.prototype.add_tab = function Edit_add_tab(link_text)
{
/*
	var new_li = document.createElement('li');
	new_li.appendChild(document.createTextNode(link_text));
	new_li.onclick = function(){window.alert('change tab');};		
	this.content_tabs.appendChild(new_li);
*/
}

Edit.prototype.close = function Edit_close()
{	
	//debugger;
	this.content_tabs.innerHTML = '';
	Elem.classAdd(this, 'hidden');
	this.stiki = null;
	window.focus();
}


/**
 * @fileoverview This script extends various javascript objects. 
 * This is done for a couple of reasons. One is to add useful 
 * functions (eg. the Array apply and fold functions. Another is 
 * to elide browser differences (eg the getComputedStyle method can 
 * be added to the IE window object). The final reason is to make
 * javascript UI elements easier to implement (eg the Element 
 * getter/setter extensions.
 * Requirements:
 * To use this file with Internet Explorer, you probably need to use the
 * following (with relative links adjusted for)...
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision: 1006 $
 */

/**
 * Errors thrown by functions in this script.
 * @constructor
 * @param {Number} errNum The error number of the error.
 * @param {String} location Code location where the error occured.
 * @param {Object} args One or more arguments to give to the error.
 */
function ExtensionsError(errNum, location, arg1, args)
{
	this.errNum = errNum;
	this.location = location;
		
	switch (errNum){
		case ExtensionsError.Codes.UNKNOWN_TYPE:
			this.description = 'checkArgs doesn\'t recognise type: ' + arg1;
			break;
		case ExtensionsError.Codes.BAD_ARGUMENTS:
			this.description = 'The arguments didn\'t match any of the expected patterns in function :' + args 
				+ ' \nPattern results were: \n' + arg1;
			break;
		case ExtensionsError.Codes.OBJECT_SELF_INHERITANCE:
			this.description = 'Object tried to inherit from itself';
			break;
		case ExtensionsError.Codes.OBJECT_SELF_EXTENSION:
			this.description = 'Object cannot extend itself';
			break;
		case ExtensionsError.Codes.UNKNOWN_ARGUMENT_PATTERN:
			this.description = 'Unknown argument pattern: ' + arg1;
			break;
		case ExtensionsError.Codes.CSSNUMBER_INVALID_UNIT:
			this.description = 'Invalid unit for new CssNumber(): ' + arg1;
			break;
		case ExtensionsError.Codes.CSSNUMBER_INVALID_NAME:
			this.description = 'Invalid value for new CssNumber(): ' + arg1;
			break;
		case ExtensionsError.Codes.CSSNUMBER_WHITESPACE_PARSE_ERROR:
			this.description = 'Could not parse css string because it contains internal whitespace: ' + arg1;
			break;
		case ExtensionsError.Codes.CSSNUMBER_VALUE_PARSE_ERROR:
			this.description = 'Could not parse a value out of the css string: ' + arg1 + ', valuePart: ' + args;
			break;
		case ExtensionsError.Codes.CSSNUMBER_UNIT_PARSE_ERROR:
			this.description = 'Could not parse a valid unit from css string: ' + arg1 + ', unitPart: ' + args;
			break;
		case ExtensionsError.Codes.CONVERSION_ERROR:
			this.description = 'Cannot convert from: ' + arg1 + ' to: ' + args;
			break;
		case ExtensionsError.Codes.INVALID_CSSNAME:
			this.description = 'Invalid cssName: ' + arg1;
			break;
		case ExtensionsError.Codes.NO_PROP_NAME:
			this.description = 'No propName supplied';
			break;
		default:
			this.description = 'Unknown error in Extensions.js___' + arg1;
			break;
	}
	
	return this;
}

/**
 * Produce a string representation of the error
 * @return A string representing the error.
 * @type {String}
 */
ExtensionsError.prototype.toString = function ExtensionsError_toString()
{
	return this.description;
}

// Todo - Move these errors into their classes.
/**
 * Error codes for errors thrown in this file.
 */
ExtensionsError.Codes = {
	UNKNOWN_TYPE: 1,
	BAD_ARGUMENTS: 2,
	OBJECT_SELF_INHERITANCE: 3,
	OBJECT_SELF_EXTENSION: 4,
	UNKNOWN_ARGUMENT_PATTERN: 5,
	CSSNUMBER_INVALID_UNIT: 6,
	CSSNUMBER_INVALID_NAME: 7,
	CSSNUMBER_WHITESPACE_PARSE_ERROR: 8, 
	CSSNUMBER_VALUE_PARSE_ERROR: 9,
	CSSNUMBER_UNIT_PARSE_ERROR: 10,
	CONVERSION_ERROR: 11,
	INVALID_CSSNAME: 12,
	NO_PROP_NAME : 13,
	UNKNOWN_ERROR : 14
}

// Extend the function object. ///////////////////

Function.prototype.getName = function Function_getName() 
{
	// Returns the name of the function, IE has the 'name' property but firefox doesn't support this.
	var thisToString = this.toString();
	var splitOnSpaces = this.toString().split(' ');
	if (splitOnSpaces.length > 1){
		var splitOnBrackets = splitOnSpaces[1].split('(');
	}
	else if (splitOnSpaces.length == 1) {
		// Then there were no spaces in the function string, we need to split on the brackets. 
		var splitOnBrackets = splitOnSpaces[0].split('(');
		splitOnBrackets = splitOnBrackets[1].split(')');
	}
	else {									// I don't know if this will ever happen...
		var splitOnBrackets = Array('');
	}
	var fnName = splitOnBrackets[0];
	return fnName;
}

Function.prototype.getArgumentNames = function Function_getArgumentNames() 
{
	// Returns an array of the names of the arguments to the function as given in the function definition.
	var argNames = this.toString().split('(')[1].split(')')[0].split(' ').join('').split(',');	
	// Return an empty array for a function with no arguments (eg function foo(){}) 
	if (argNames.length == 1 && argNames[0] == '') argNames = new Array();
	return argNames;
}

// From a function, you can call this method to check that the arguments you received
// are the same as what you expected.
Function.prototype.checkArgs = function Function_checkArgs(argsToCheck, rest)
{
	//
	// Todo - Check the number of arguments. 
	// Todo - Recognise a '...' token to indicate that an arbitrary number of arguments follow
	// Todo - Let callers specify constraints, eg. [['string' , arg.length < 25], ['number', 0 < arg < 100]]
	// 		- The order for the checks would be numArgs -> argTypes -> argConstraints.
	//
	// Usage: Function.checkArgs(arguments, ['string', 'number'], ['boolean'], ...);
	// the first argument is the arguments that the function received. After this, add as many
	// lists of arrayTypes as the function can accept. Does not check for extra arguments.	
	//	
	// Types to test, (string, number, boolean, object, function, 'any' (don't care), undefined)).

	var allPatternsProblems = new Array();
	var passedAPattern = false;
	var firstMatchedPatternIndex = -1; // arguments.length;

	// Go through all the typeLists we were given
	patterns: for (var i = 1; i < arguments.length; i++){
		var typeList = arguments[i];
		var passedThisPattern = true;
		var thisPatternProblems = '';

		// Go through each of the expected types in this list and match against the actual argument types
		types: for (var j = 0; j < typeList.length; j++){
			var type = typeList[j];
			// '' means the caller doesn't care about the type of the argument.
			if (type != 'any') {
				// Check that the type given to us is actually a valid type
				if (type != 'string' 
					&& type !='number' 
					&& type != 'boolean' 
					&& type != 'object' 
					&& type != 'function'
					&& type != 'undefined'){
					throw(new ExtensionsError(ExtensionsError.Codes.UNKNOWN_TYPE, 'Function.prototype.checkArgs', type));		
				}
				if (thisPatternProblems) thisPatternProblems += '\n'
				if (typeof(argsToCheck[j]) != type){
					thisPatternProblems += ['\targ: ', j, ' got [', typeof(argsToCheck[j]), ']'].join('');
					passedThisPattern = false;
				}
				else {
					thisPatternProblems += '\targ: ' + j + ' ...ok'; 				
				}
			}
		}		
		// At this stage, we can look at whether the pattern matched.		
		if (passedThisPattern){
			// Then we've found a pattern that passes, we can break and return which pattern was matched.
			passedAPattern = true;
			firstMatchedPatternIndex = i - 1;
			break patterns;
		}	
		else {
			// Then there was some kind of error with this pattern, push it onto the array of problems
			allPatternsProblems.push(['Problems with pattern [', typeList, ']: \n', thisPatternProblems].join(''));
		} 			
	}
	if (! passedAPattern){
		// Then we need to throw an exception
		throw(new ExtensionsError(ExtensionsError.Codes.BAD_ARGUMENTS, 'Function.prototype.checkArgs', allPatternsProblems.join('\n'), argsToCheck.callee.getName()));
	}
	else {
		return firstMatchedPatternIndex;
	}	
} 

///////////////////////////////////////////////////////////////////////////
//
// Static methods for the Function object.
// 

Function.inherit = function Function_inherit(derivedClass, baseClass)
{
	if (derivedClass != baseClass){
		derivedClass.prototype = new baseClass;
		derivedClass.prototype.constructor = derivedClass;
		derivedClass._baseConstructor = baseClass;
	}
	else {
		throw(new ExtensionsError(ExtensionsError.Codes.OBJECT_SELF_INHERITANCE, 'Function.inherit'));
	}	
}
	
// Method to call an overridden method
Function._base = function Function__base(instance, constructorFn, funcName, args)
{
	//Function.checkArgs(arguments, ['function', 'string', 'any'])
	var retVal;
	if (instance[funcName]){
		// Temporarily delete the function from the prototype, so we can look for one
		// further up the inheritance chain.
		var currFunc = instance[funcName];
		delete constructorFn.prototype[funcName];
		if (instance[funcName]){
			// Then there is a version further up the inheritance chain.
			retVal = instance[funcName].apply(instance, Array.prototype.slice.apply(arguments, [2]));
		}
		// Put the function back into the prototype
		constructorFn.prototype[funcName] = currFunc;
	}
	return retVal;
}

///////////////////////////////////////////////////////////////////////////
//
// Static methods for the Object object.
// 

Object.myExtend = function Object_myExtend(target, source, propArray)
{
	if (target === source){
		throw(new ExtensionsError(ExtensionsError.Codes.OBJECT_SELF_EXTENSION, 'Object.myExtend'));
	}
	else {
		if (propArray){		// Copy only those members specified in propArray from the source into this.
			for (var i = 0; i < propArray.length; i++){
				var prop = propArray[i];
				if (source[prop] && ! target[prop]) target[prop] = source[prop];
			}
		}
		else {				// Copy all of the members of the source into this.
			for (var prop in source){
				if (! target[prop]) target[prop] = source[prop];	// Only copy the property if there isn't already that property in the target.
			}
		}
	}
}

// Method to override a method currently in the object. This is useful when altering methods gained through the object.myExtend method
Object.override = function Object_override(instance, funcName, newFunc)
{
	newFunc._overridden = instance[funcName];
	instance[funcName] = newFunc;
}

///////////////////////////////////////////////////////////////////////////
//
// Extend the Array object.
//

Array.prototype.map = function Array_map(func)
{
	// Applies the specified argument to each of the elements in the Array
	var retArray = [];
	for (var i = 0; i < this.length; i++) retArray[i] = func(this[i]);
	return retArray;
}

Array.prototype.fold = function Array_fold(func)
{
	// Folds the array with the function
	var acc;
	if (this.length == 0){
		return func();
	}
	else if (this.length == 1){
		return func(this[0]);
	}
	else {
		acc = this[0];
		for (var i = 1; i < this.length; i++) acc = func(acc, this[i]);
		return acc;
	}
}

Array.prototype.compare = function Array_compare(comparisonArray)
{
	var equiv = this.length == comparisonArray.length;
	for (var i = 0; i < this.length && equiv; i++) equiv = this[i] === comparisonArray[i];
	return equiv;
}

///////////////////////////////////////////////////////////////////////////
//
// Extend the String object.
//

String.prototype.toSentenceCase = function String_toSentenceCase()
{
	// Returns a the string in sentence case. Eg. 'my new string'.toSentenceCase() = 'My new string';
	var retStr = '';
	if (this.length > 0){
		retStr = this.charAt(0).toUpperCase() + this.substr(1, this.length);
	}
	return retStr;
}

// CssNumber /////////////////////////////////////

/**
 * A class to represent css numbers. Provides methods for converting
 * between different units (em, px, pt %).
 * @constructor
 * @param {String} cssString A string as used in css which will be parsed into a
 * 				  	css number.
 * @param {Number} cssString The first argument can also be a number for the value
 * 					part of the css number. In this case, it is necessary to provide
 * 				  	the final argument to specify the unit to use.
 * @param {String} unit	The unit to create the CssNumber in. 
 * @return A new CssNumber object.
 * @type {CssNumber}
 */
function CssNumber(cssString, unit)
{
	var firstPattern = Function.checkArgs(arguments, ['string', 'undefined'], ['number', 'string']);

	switch (firstPattern){
		case 0:					// ['string']	
			var parseArray = this._parse(cssString);
			var newValue = parseArray[0];
			var newUnit = parseArray[1];
			break;
		case 1:					// ['number', 'string']
			var newValue = Number(cssString);
			var newUnit = unit; 								// this._trimTrailingSpace(unit);
			break;
		default: 
			throw(new ExtensionsError(ExtensionsError.Codes.UNKNOWN_ARGUMENT_PATTERN, 'CssNumber'));
			break;
	}
	
	// Check that the values and units are valid.
	if (newUnit != 'px' && newUnit != 'pt' && newUnit != 'em' && newUnit != '%'){
		throw(new ExtensionsError(ExtensionsError.Codes.CSSNUMBER_INVALID_UNIT, 'CssNumber', newUnit));	
	}
	else if (isNaN(newValue)){
		throw(new ExtensionsError(ExtensionsError.Codes.CSSNUMBER_INVALID_NAME, 'CssNumber', newValue));
	}
	
	// If we get to here, then the values and units are valid
	this.value = newValue;
	this.unit = newUnit;
		
	/*
	this.unitDiv = document.getElementById('unitDiv');
	if (! this.unitDiv){
		tmpDiv = document.createElement('div');
		//tmpDiv.style.width = '100em';
		tmpDiv.className = 'unitDiv';
		this.unitDiv = tmpDiv;
		document.body.appendChild(this.unitDiv);
	}
	this.cs = window.getComputedStyle;
	*/
	
	return this;
}

CssNumber.prototype._trimLeadingSpace = function CssNumber__trimLeadingSpace(stringToTrim)
{
	var reLeadingSpace = /^\s*/;
	return stringToTrim.replace(reLeadingSpace, '');
}

CssNumber.prototype._trimTrailingSpace = function CssNumber__trimTrailingSpace(stringToTrim)
{
	var reTrailingSpace = /\s*$/;
	return stringToTrim.replace(reTrailingSpace, '');
}

/**
 * Parse a css string to get the number part and the value part.
 * @param {String} cssString String to parse.
 * @return an Array containing the value part and the unit part.
 * @type {Array}
 */
CssNumber.prototype._parse = function CssNumber__parse(cssString)
{
	// the first thing to do is remove leading and trailing spaces, as these don't affect the number
	Function.checkArgs(arguments, ['string']);
		
	var trimStr = this._trimLeadingSpace(cssString);
	trimStr = this._trimTrailingSpace(trimStr);
	
	// Check that there are no spaces in the string
	var reWhitespace = /\s/;
	if (reWhitespace.test(trimStr)){
		throw(new ExtensionsError(ExtensionsError.Codes.CSSNUMBER_WHITESPACE_PARSE_ERROR, 'CssNumber.prototype._parse', cssString));
	}
	else {
		// Get the number part using a regular expression
		var reCssParse = /(\S*?)(px|pt|em|%)$/;
		
		var valuePart = trimStr.replace(reCssParse, '$1');
		var unitPart = trimStr.replace(reCssParse, '$2');
		
		// Check the validity of what we've parsed
		if (valuePart == ''){							// Probably passed something like 'px'
			throw(new ExtensionsError(ExtensionsError.Codes.CSSNUMBER_VALUE_PARSE_ERROR, 'CssNumber.prototype._parse', cssString, valuePart));
		}
		else if (isNaN(valuePart)){
			throw(new ExtensionsError(ExtensionsError.Codes.CSSNUMBER_VALUE_PARSE_ERROR, 'CssNumber.prototype._parse', cssString, valuePart));
		}
		else if (unitPart != 'px' && unitPart != 'pt' && unitPart != 'em' && unitPart != '%'){
			throw(new ExtensionsError(ExtensionsError.Codes.CSSNUMBER_UNIT_PARSE_ERROR, 'CssNumber.prototype._parse', cssString, unitPart));
		}
		else {
			return Array(Number(valuePart), unitPart);
		}
	}
}

/**
 * Return a string representation of the number.
 * @return A string for the number in Css format.
 * @type {String}
 */
CssNumber.prototype.toString = function CssNumber_toString()
{
	Function.checkArgs(arguments, ['undefined']);
	var unitPart = this.unit;
	return String(this.value) + unitPart;
}

/**
 * Convert the value to the new units and return a new CssNumber
 * toUnit is the unit that is to be converted to, and domParent 
 * is a reference to the dom parent that the conversion is 
 * relative to - this is because some units (%, em) are relative 
 * to some aspect of the dom. If no domParent is supplied, and 
 * one is required, then the function defaults to using document.body
 * @param {String} toUnit The unit to convert to.
 * @param {Object} domContext The dom context within which to perform the
 * 					conversion.
 * @return A new CssNumber object
 * @type {CssNumber}
 */
CssNumber.prototype.convertTo = function CssNumber_convertTo(toUnit, domContext)
{
	Function.checkArgs(arguments, ['string', 'object'], ['string', 'undefined']);

	// If no dom context was given then use the default
	if (! domContext) var domContext = Elem.defaultDomContext || document.body;

	// If the toUnit is the same as the current unit, then just return this.
	var retCssNumber = this;
	
	if (this.unit != toUnit){
		// Determine how many fromUnits per 100px.
		var pxPer100FromUnit = 100;
		var pxPer100ToUnit = 100;

		//if (! domContext) var domContext = document.body;
		
		if (this.unit != 'px'){
			var cssString = '100' + this.unit;
			pxPer100FromUnit = this._measureDiv(cssString, domContext);
		}
	
		if (toUnit != 'px'){
			var cssString = '100' + toUnit;
			pxPer100ToUnit = this._measureDiv(cssString, domContext);
		}
				
		var toValue = (this.value * pxPer100FromUnit) / pxPer100ToUnit;
	
	
		retCssNumber = new CssNumber(toValue, toUnit);
	} 
	
	return retCssNumber;
}

/**
 * Insert a tmpDiv with the specified dimension into 
 * the dom context so we can calculate the dimension in 
 * pixels.
 */
CssNumber.prototype._measureDiv = function CssNumber__measureDiv(cssString, domContext)
{
	var tmpDiv = document.createElement('div');
	tmpDiv.style.visibility = 'visible';
	tmpDiv.style.backgroundColor = 'red';
	tmpDiv.style.zIndex = 100;
	tmpDiv.style.height = cssString;
	
	try{
		domContext.appendChild(tmpDiv);
	}
	catch (e){
		//debugger ;
	}
	if (window.getComputedStyle){
		var retVal = window.getComputedStyle(tmpDiv, '').getPropertyValue('height');
		retVal = this._parse(retVal)[0];
	}
	else {
		var retVal = tmpDiv.offsetHeight;		
	}
	
	try {
		// Todo - we should probably just leave it there.
		domContext.removeChild(tmpDiv);	
	}
	catch (e){
        // debugger;
  	}
	return retVal;
}

/**
 * Add two CssNumbers together and return a new CssNumber with the result.
 * @param {CssNumber} rNum CssNumber to add to this number.
 * @param {Object} domContext (optional) The dom context in which to
 * 					perform the addition. Necessary if either of the 
 * 					numbers need to be converted.
 * @return A new CssNumber which equals this + rNum
 * @type {CssNumber}
 */
CssNumber.prototype.add = function CssNumber_add(rNum, domContext)
{
	Function.checkArgs(arguments, ['object', 'object'], ['object', 'undefined']);
	
	var rNumConverted = null;
	
	if (rNum.unit != this.unit){
		//if (! domContext) var domContext = document.body;
		var rNumConverted = rNum.convertTo(this.unit, domContext);
		var retNum = new CssNumber(this.value + rNumConverted.value, this.unit);
	}
	else {
		var retNum = new CssNumber(this.value + rNum.value, this.unit);	
	}
	return retNum;
}

/**
 * Subtract two CssNumbers and return the result in a new CssNumber.
 * @param {CssNumber} rNum CssNumber to subtract from this.
 * @param {Object } domContext (optional) The dom context in which to 
 * 					perform the subtraction. Necessary if the numbers
 * 					have different units. 
 * @return A new CssNumber which equals this - rNum.
 * @type {CssNumber}
 */
CssNumber.prototype.subtract = function CssNumber_subtract(rNum, domContext)
{
	Function.checkArgs(arguments, ['object', 'object'], ['object', 'undefined']);
	
	if (rNum.unit != this.unit){
		//if (! domContext) var domContext = document.body;
		var rNumConverted = rNum.convertTo(this.unit, domContext);
		var retNum = new CssNumber(this.value - rNumConverted.value, this.unit);
	}
	else {
		var retNum = new CssNumber(this.value - rNum.value, this.unit);
	}
	return retNum;
}

// Extend the Element object. ////////////////////


// IE doesn't present dom elements as javascript objects, so these 
// extensions don't show up automatically. Instead, we need to use
// the 'Emulating prototyping of DOM objects in Internet Explorer' 
// method, described at http://delete.me.uk/2004/09/ieproto.html
		
/**
 * @class The elem object holds functions for dom elements. 
 * I have had to put these functions into an object rather than
 * extending dom elements directly because IE doesn't allow this.
 * @constructor 
 */
function Elem(){};	// This is just to fool JsDoc into parsing this as a class. 
Elem = new Object();

Elem.defaultDomContext = null;			// Default will be document.body - unless this is set to something else.

// I adapted the following functions from the 'unobtrusive javascript' article.

/**
 * Check that a css class name is valid. 
 * <ul>
 * <li>I can't actually find any info what the rules for valid
 * css class names are at the moment.</li>
 * <li> For now, I'll just impose the following restrictions:</li>
 * <ul>
 * <li>Must not contain spaces.</li>
 * <li>Cannot be the empty string.</li>
 * </ul>
 * </ul>
 * @param {String} classToValidate Class name to check.
 * @return true if the name is valid, false otherwise.
 * @type {Boolean}
 */
Elem._validClassName = function Elem__validClassName(classToValidate)
{
	Function.checkArgs(arguments, ['string']);
	return classToValidate.indexOf(' ') < 0 && 0 < classToValidate.length;
}

/**
 * Check whether an element contains a class name.
 * @param {Object} elem Dom element to check
 * @param {String} classToCheck Class name to check for.
 * @return True if the element already has the classname, false otherwise.
 * @type {Boolean}
 */
Elem.classCheck = function Elem_classCheck(elem, classToCheck)
{
	// Return true if 'classToCheck' is one of the classes in the element's className.
	//Function.checkArgs(arguments, ['object', 'string']);
	
	// Check that 'classToCheck' contains only valid characters.
	if (! Elem._validClassName(classToCheck)){
		throw(new ExtensionsError(ExtensionsError.Codes.INVALID_CSSNAME, 'Elem.classCheck', classToCheck));
	}
	else {	
  		return new RegExp('\\b'+classToCheck+'\\b').test(elem.className);
	}
}

/**
 * Add the specified class to the element's className property
 * (if it is not already there).
 * @param {Object} elem The element to operate on.
 * @param {String} classTo Add The class name to add. 
 * @return The resulting class name of the element.
 * @type {String}
 */
Elem.classAdd = function Elem_classAdd(elem, classToAdd)
{
	//Function.checkArgs(arguments, ['object', 'string']);
	if(!Elem.classCheck(elem, classToAdd)) elem.className += elem.className ? ' ' + classToAdd : classToAdd;
	return elem.className;
}

/**
 * Remove the class name from the element if it is 
 * present. No change otherwise.
 * @param {Object} elem The dom element to operate on.
 * @param {String} classToRemove Class name to remove.
 * @return The resulting element class name.
 * @type {String}
 */
Elem.classRemove = function Elem_classRemove(elem, classToRemove)
{
	//Function.checkArgs(arguments, ['object', 'string']);
	if (Elem.classCheck(elem, classToRemove)){
		var rep = elem.className.match(' ' + classToRemove) ? ' ' + classToRemove : classToRemove;
		elem.className = elem.className.replace(rep,'');
	}
	return elem.className;
}

/**
 * If the element's className property contains 
 * 'classOut', then it is swapped for 'classIn'.
 * No change otherwise.
 * @param {Object} elem The dom element to operate on.
 * @param {String} classOut Class name to swap out.
 * @param {String} classIn Class name to swap in.
 * @return The class name for the element.
 * @type {String}
 */
Elem.classSwap = function Elem_classSwap(elem, classOut, classIn)
{
	//Function.checkArgs(arguments, ['object', 'string', 'string']);

	if (Elem.classCheck(elem, classOut)){
		// Check that the supplied class name for classIn is valid
		if (Elem._validClassName(classIn)){
			elem.className = elem.className.replace(classOut, classIn);					
		}
		else {
			throw(new ExtensionsError(ExtensionsError.Codes.INVALID_CSSNAME, 
				'Elem.classSwap', classIn));	
		}
	}
	return elem.className;
}

/**
 * Get the left value for the element.
 * @param {Object} elem The dom element to compute left for.
 * @param {String} unit Unit to return the left value in
 * 					('px', 'em', 'pt', '%');
 * @return A CssNumber representing the left position of the element.
 * @type {CssNumber} 
 */
Elem.getLeft = function Elem_getLeft(elem, unit)
{
	//Function.checkArgs(arguments, ['object', 'string'], ['object', 'undefined']);
	if (! unit) var unit = 'em';

	var cssStr = elem.style.left;
	if (cssStr == ""){ 				//  || (cssStr == 'auto')){
		// Try to get a computed style.
		if (window.getComputedStyle){
			cssStr = window.getComputedStyle(elem, '').getPropertyValue('left');
							
			// If the css string is still auto, then how do I turn that into a number??
			if (cssStr == 'auto'){
				var calcVal = elem.offsetLeft;
				var elemParent = elem.offsetParent;
				while (elemParent){
					calcVal += elemParent.offsetLeft;
					elemParent = elemParent.offsetParent;
				}
				cssStr = calcVal + 'px';
			}
		}
		else {
			cssStr = elem.offsetLeft;
		}
	}	
	if (typeof(cssStr) == 'number' || Number(cssStr)){
		cssStr += 'px';
	}
	
	var retNum = new CssNumber(cssStr);

	if (retNum.unit != unit) retNum = retNum.convertTo(unit, elem.parentNode);	
	return retNum;		
}

Elem.getTop = function Elem_getTop(elem, unit)
{
	//Function.checkArgs(arguments, ['object', 'string'], ['object', 'undefined']);
	if (! unit) var unit = 'em';

	var cssStr = elem.style.top;
	if (cssStr == ""){ 				//  || (cssStr == 'auto')){
		// Try to get a computed style.
		if (window.getComputedStyle){
			cssStr = window.getComputedStyle(elem, '').getPropertyValue('top');
							
			// If the css string is still auto, then how do I turn that into a number??
			if (cssStr == 'auto'){
				var calcVal = elem.offsetTop;
				var elemParent = elem.offsetParent;
				while (elemParent){
					calcVal += elemParent.offsetTop;
					elemParent = elemParent.offsetParent;
				}
				cssStr = calcVal + 'px';
			}
		}
		else {
			cssStr = elem.offsetTop;
		}
	}
	if (typeof(cssStr) == 'number' || Number(cssStr)){
		cssStr += 'px';
	}
	
	var retNum = new CssNumber(cssStr);

	if (retNum.unit != unit) retNum = retNum.convertTo(unit, elem.parentNode);	
	return retNum;
}

Elem.getWidth = function Elem_getWidth(elem, unit)
{
	//Function.checkArgs(arguments, ['object', 'string'], ['object', 'undefined']);
	if (! unit) var unit = 'em';
	
	var cssStr = elem.style.width;
	if (cssStr == ""){ 				//  || (cssStr == 'auto')){
		cssStr = elem.offsetWidth;
		if (cssStr == ""){
			// Try to get a computed style.
			if (window.getComputedStyle){
				cssStr = window.getComputedStyle(elem, '').getPropertyValue('width');
								
				// If the css string is still auto, then how do I turn that into a number??
				if (cssStr == 'auto'){
						cssStr = elem.offsetWidth;
						cssStr += 'px';
				}
			}
		}
	}

	// Guard against IE sometimes returning a bare number. 
	if (typeof(cssStr) == 'number' || Number(cssStr)){
		cssStr += 'px';
	}	
			
	var retNum = new CssNumber(cssStr);

	if (retNum.unit != unit) retNum = retNum.convertTo(unit, elem.parentNode);	
	return retNum;
}

Elem.getHeight = function Elem_getHeight(elem, unit)
{
	//Function.checkArgs(arguments, ['object', 'string'], ['object', 'undefined']);
	if (! unit) var unit = 'em';
	
	var cssStr = elem.style.height;
	if (cssStr == ""){ 				//  || (cssStr == 'auto')){
		cssStr = elem.offsetHeight;
		if (cssStr == ""){
			// Try to get a computed style.
			if (window.getComputedStyle){
				cssStr = window.getComputedStyle(elem, '').getPropertyValue('height');
								
				// If the css string is still auto, then how do I turn that into a number??
				if (cssStr == 'auto'){
						cssStr = elem.offsetHeight;
						cssStr += 'px';
				}
			}
		}
	}
	
	// Guard against IE sometimes returning a bare number. 
	if (typeof(cssStr) == 'number' || Number(cssStr)){
		cssStr += 'px';
	}
	
	var retNum = new CssNumber(cssStr);

	if (retNum.unit != unit) retNum = retNum.convertTo(unit, elem.parentNode);	
	return retNum;
}

Elem.getBackgroundColor = function Elem_getBackgroundColor(elem)
{
	//Function.checkArgs(arguments, ['object']);

	var retCol = '';
	if (window.getComputedStyle){
		retCol = window.getComputedStyle(elem, '').getPropertyValue('background-color');
	}
	else {
		retCol = elem.currentStyle.backgroundColor;
	}
	return retCol;
}

// Returns the descendant of this element with the specified id.
Elem.getDescendantById = function Elem_getDescendantById(elem, theId)
{
	Function.checkArgs(arguments, ['object', 'string']);

	var retNode = null;
	if (elem.id == theId){
		retNode = elem;
	}
	else {
		if (elem.hasChildNodes()){
			for (var i = 0; i < elem.childNodes.length; i++){
				var childNode = elem.childNodes[i];
				if (childNode.nodeType == Node.ELEMENT_NODE){
					retNode = Elem.getDescendantById(childNode, theId);
					if (retNode != null ) break;
				}
			}
		}
	}
	return retNode;		
}

// Returns an array of any descendants of the element with the specified className
Elem.getDescendantsByClassName = function Elem_getDescendantsByClassName(elem, className)
{
  Function.checkArgs(arguments, ['object', 'string']);
  
  var retArray = new Array();
  	
  for (var i = 0; i < elem.childNodes.length; i++){
  	var childNode = elem.childNodes[i];
	if (childNode.nodeType == Node.ELEMENT_NODE){
		if (Elem.classCheck(childNode, className)) retArray.push(childNode);
			retArray = retArray.concat(Elem.getDescendantsByClassName(childNode, className));  	
		}
	}
	return retArray;
}

// This function recursively prepends the specified prefix to the id of 
// a DOM element and any child nodes, provided that they already have an id.
Elem.prependChildIds = function Elem_prependChildIds(elem, idPrefix)
{
	Function.checkArgs(arguments, ['object', 'string']);
	
	if (elem.hasChildNodes()){
		// Append the ids of all the child nodes.
		for (var i = 0; i < elem.childNodes.length; i++){
			var childNode = elem.childNodes[i];
			if (childNode.nodeType == Node.ELEMENT_NODE){			
				if (childNode.id) childNode.id = idPrefix + childNode.id;	
				Elem.prependChildIds(childNode, idPrefix);		
			}
		}	
	}		
}

// This function disables the default drag-drop behavior of an element by
// setting the mousedown, mousemove, and mouseup event handlers to fnFalse.
// This function will overwrite any existing event handlers, so it should be
// called first. 
Elem.disableDragDrop = function Elem_disableDragDrop(elem)
{
	Function.checkArgs(arguments, ['object']);
	
	Event.myObserve(elem, 'mousedown', fnFalse);
	//Event.myObserve(elem, 'mousemove', fnFalse);
	//Event.myObserve(elem, 'mouseup', fnFalse);
}

/**
 * Clones the supplied template and adjusts dom_ids to include
 * the supplied class name. 
 * @param {Object} template
 */
Elem.clone_template = function Elem_clone_template(template)
{
	var copy = template.cloneNode(true);
	var copy_id = new Date().getTime();
	var new_id = copy.id.replace(/template/, 'new_' + copy_id);
	// Check that the id is unique in the page.
	while ($(new_id)){
		copy_id += 1;
		new_id = copy.id.replace(/template/, 'new_' + copy_id);
	}
	
	copy.id = new_id;
	copy.innerHTML = copy.innerHTML.replace(/template/g, 'new_' + copy_id);
	return copy;	
}

///////////////////////////////////////////////////////////////////////////
//
// Extend the Event object.
//
// As with the Element object, IE doesn't present an Event object. I'm still
// not sure how I would go about adding these to the IE window.event object.
// Perhaps the 'Emulating prototyping of DOM objects in Internet Explorer' 
// method would work, but I'm doubtful, because window.event isn't a DOM 
// object is it? 
//
// For now, I'm just making these functions.
//
// This section is commented out until I've tested the remainder of the 
// scripts (on IE and Moz) and have figured out how to make this section
// work on IE.


/**
 * This function returns a pageX for the event, which is the 
 * x-position of the event relative to the document. Firefox
 * has a pageX function, which returns the value, but IE doesn't.
 * Compare with the e.clientX property, which both IE and Firefox 
 * have.
 */
function getPageX(e, unit)
{
	if (! unit) var unit = 'em';	
	var scrollX = (document.documentElement.scrollLeft || document.body.scrollLeft);
	var retVal = (e.pageX || e.clientX + scrollX);
	retVal = new CssNumber(retVal, 'px');
	retVal = retVal.convertTo(unit); 
	return retVal;		
}

/**
 * This function returns a pageX for the event, which is the 
 * x-position of the event relative to the document. Firefox
 * has a pageX function, which returns the value, but IE doesn't.
 * Compare with the e.clientX property, which both IE and Firefox 
 * have.
 */
function getPageY(e, unit)
{
	if (! unit) var unit = 'em';	
	var scrollY = (document.documentElement.scrollTop || document.body.scrollTop);
	var retVal = (e.pageY || e.clientY + scrollY);
	retVal = new CssNumber(retVal, 'px');
	retVal = retVal.convertTo(unit); 
	//debugger;
	
	return retVal;		
}

if (! Event) var Event = {};

Event.myObserve = function Event_myObserve(elem, eventName, newHandler)
{
	Function.checkArgs(arguments, ['object', 'string', 'function']);
	
	try{
		if (! elem['on' + eventName]){
			// No events registered yet. Create a new event handler object.
			elem['on' + eventName] = Event._myEventHandler(newHandler);
		}
		else {
			// Already some events registered. Add to existing.
			elem['on' + eventName].ehs.push(newHandler);		
		}
	}
	catch (e){
	   //window.alert('debugger');
		//debugger;
		//window.alert('elem: ' + elem + ', eventName: ' + eventName + ', newHandler: ' + newHandler)
		//window.alert('e: ' + e);
	}
}

/**
 * Returns a 'event handler' function has an array of 
 * functions to call and calls them in order.
 */
Event._myEventHandler = function Event__myEventHander(handler)
{
	var retFn = function (e){
		var e = e || window.event;
		var lastResult = null;
		// Call each event handler in turn.
		for (var i = 0; i < arguments.callee.ehs.length; i++){
			lastResult = arguments.callee.ehs[i](e);
		}
		return lastResult;
	}
	retFn.ehs = [handler];
	return retFn;
}

///////////////////////////////////////////////////////////////////////////
//
// Node.
//
///////////////////////////////////////////////////////////////////////////

if (! window.Node){
	// window.alert('window.Node not present, must be IE?');
	
	//*
	Node = {
		ELEMENT_NODE : 1,
		ATTRIBUTE_NODE : 2,
		TEXT_NODE : 3,
		CDATA_SECTION_NODE : 4,
		ENTITY_REFERENCE_NODE : 5,
		ENTITY_NODE : 6,
		PROCESSING_INSTRUCTION_NODE : 7,
		COMMENT_NODE : 8,
		DOCUMENT_NODE : 9,
		DOCUMENT_TYPE_NODE : 10,
		DOCUMENT_FRAGMENT_NODE : 11,
		NOTATION_NODE : 12
	};
	/**/
	/*
	DOCUMENT_POSITION_DISCONNECTED : 1,
	DOCUMENT_POSITION_PRECEDING : 2,
	DOCUMENT_POSITION_FOLLOWING : 4,
	DOCUMENT_POSITION_CONTAINS : 8,
	DOCUMENT_POSITION_CONTAINED_BY : 16,
	DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC : 32,
	*/
}



/**
 * Convert an hsl triplet into an rgb one.
 * This algorithm is adapted from:
 *     http://130.113.54.154/~monger/hsl-rgb.html
 */
var Css = {};

Css.Color = {};
Css.Color.hsl_to_rgb = function Css_hsl_to_rgb(H, S, L)
{
    var temp1, temp2;
    var R, G, B = null;
    if (S == 0){
        R = G = B = L;
    }
    else {
        if  (L < 0.5){
            temp2 = L * (1 + S); 
        }
        else {
            temp2 = L + S - L * S;
        }
        
        temp1 = 2 * L - temp2;
        
        //H = 360 % H;
        H = H / 360;
                
        function get_rgb_component(temp3){
            var color = null;

            if (temp3 < 0) temp3 += 1;
            if (temp3 > 1) temp3 -= 1;
            
            if (6 * temp3 < 1){
                color= temp1 + (temp2 - temp1) * 6 * temp3;
            }
            else if ((2 * temp3) < 1){
                color = temp2;
            }
            else if ((3 * temp3) < 2){
                color = temp1 + (temp2 - temp1) * (2/3 - temp3)* 6;
            }
            else {
                color = temp1;
            }
            return Math.round(color * 100, 0);
        }
        
        R = get_rgb_component(H + 1/3);
        G = get_rgb_component(H);
        B = get_rgb_component(H - 1/3);
    } 
    return "rgb(" + R + "%," + G + "%," + B + "%)";
    //return {R: R, G: G, B: B };
}

/**
 * Convert an rgb color value to hsl.
 */
Css.Color.rgb_to_hsl = function rgb_to_hsl()
{
    throw "Not implemented";
}

/**
 * Lighten a Css color by the specified amount.
 */
Css.Color.lighten = function Css_Color_lighten(rgb, amount)
{
    
}

///////////////////////////////////////////////////////////////////////////
//
// Functions.
//
///////////////////////////////////////////////////////////////////////////

// A function to attach to images so the default drag-drop behavior is 
// disabled. 
function fnFalse()
{
	return false;
}

/**
 * Rounds the supplied number to 2 decimal places.
 */
Math.round_to = function(number, precision)
{
    var precision_adjustment = Math.pow(10, precision || 1);
    return Math.round(number * precision_adjustment) / precision_adjustment;
}

//window.alert('Extensions.js');


/**
 * @fileoverview This script provides a Mover class, which can be used to 
 * control the dragging and dropping of multiple simultaneous children objects.
 * To use this class, a child object needs to store a reference to it, and 
 * add a call to Mover.move() with itself and the event as an argument to 
 * initiate movement (most likely following a mousedown event).
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision: 1553 $
 */

function Mover(moveSpace)
{
	var argPattern = Function.checkArgs(arguments, ['undefined'], ['object'])
	
	if (argPattern == 1){
		Object.myExtend(moveSpace, this);
		moveSpace.isMoving = false;		
		
		//console.log("moveSpace.id: " + moveSpace.id);
			
		moveSpace.cursorWrap = document.createElement('DIV');	
		with (moveSpace.cursorWrap){
			offsetX = new CssNumber(0, 'em');
			offsetY = new CssNumber(0, 'em');
			className = "cursorWrap";
			var sfx = 1;
			while ($("cursorWrap_" + sfx)) ++sfx;
	
			id = "cursorWrap_" + sfx;
		}
		moveSpace.appendChild(moveSpace.cursorWrap);
			
		Event.myObserve(document, 'mousemove', Mover.onmousemove.bindAsEventListener(moveSpace));
		Event.myObserve(document, 'mouseup', Mover.onmouseup.bindAsEventListener(moveSpace));
	}
	return moveSpace;
}

/**
 * 
 * @param {Object} e
 * @param {Object} elems
 */
Mover.prototype.move = function Mover_move(e, elems)
{
	if (this.isMoving) return;
	
	// Add all of the selected stikis to the move space.
	for (var i = 0; i < elems.length; i++){
		var elem = elems[i];
		var origLeft = new CssNumber(elem.get_left_edge(), 'em').convertTo('px', elem);
		var origTop = new CssNumber(elem.get_top_edge(), 'em').convertTo('px', elem);
		elem.parentNode.removeChild(elem);
		elem.style.left = origLeft.toString();
		elem.style.top = origTop.toString();
		Elem.classAdd(elem, 'moving');
		this.cursorWrap.appendChild(elem);	       
	}
	
	this.isMoving = true;
	this.hasMoved = false;
	if (! e) var e = window.event;
	this.cursorWrap.offsetX = getPageX(e, 'px');
	this.cursorWrap.offsetY = getPageY(e, 'px');
}

/**
 * @param {Object} e
 */
Mover.onmousemove = function Mover_onmousemove(e)
{
	if(! this.isMoving) return;
	
  this.hasMoved = true;
	if (! e) var e = window.event;
	var eX = getPageX(e, 'px');
	var eY = getPageY(e, 'px');

	var newLeft = eX.value - this.cursorWrap.offsetX.value; 
	var newTop = eY.value - this.cursorWrap.offsetY.value;

	this.cursorWrap.style.left = newLeft + 'px';
	this.cursorWrap.style.top = newTop + 'px';	
}

/**
 * 
 * @param {Object} e
 */
Mover.onmouseup = function Mover_onmouseup(e)
{	
	if (! this.isMoving) return;	
	if (! e) var e = window.event;	
	var to_update = [];

	while (this.cursorWrap.childNodes.length > 0) {		
		var elem = this.cursorWrap.childNodes[0];
				
		var currLeft = Elem.getLeft(elem, 'px'); 
		var wrapLeft = Elem.getLeft(this.cursorWrap, 'px'); 
		var newLeft = currLeft.value + wrapLeft.value;
		var currTop = Elem.getTop(elem, 'px'); 
		var wrapTop = Elem.getTop(this.cursorWrap, 'px'); 
		var newTop = currTop.value + wrapTop.value;
		
		this.cursorWrap.removeChild(elem);			
		this.appendChild(elem);
		if (elem.set_z_index) elem.set_z_index('front');	
		
		var left_edge_in_em = new CssNumber(newLeft, 'px').convertTo('em', elem).value; 
		var top_edge_in_em = new CssNumber(newTop, 'px').convertTo('em', elem).value; 
		
		elem.set_left_edge(left_edge_in_em);
		elem.set_top_edge(top_edge_in_em);

		Elem.classRemove(elem, 'moving');		
		if (elem.model){
			to_update.push(elem);
		} 
		if (typeof(elem.finish_move) == 'function'){
			elem.finish_move(e);				
		} 
	}
	
	if(this.selection && typeof(this.selection.update_all) == 'function'){
		this.selection.update_all('Mover');
	}
	else {
		for(var i = 0; i < to_update.length; i++){
			to_update[i].model.update(elem, 'Mover');			
		}		
	}
	this.cursorWrap.style.left = '';
	this.cursorWrap.style.top = '';
	this.isMoving = false;
}

/**
 * @classDescription This class represents the page of stikies. It has methods 
 * for adding and saving stikis, maintains a collection of stikis, and has 
 * methods for handling the synchronisation of the page with the server.	
 * @constructor
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision: 1790 $
 */
function Page(elem, model)
{
	this.model = model;
	this.dirty_flags = {};
	this.stikis = {};
	
	if ($('page').addEventListener){
		// Mozilla (and Safari).
		$('page').addEventListener('DOMMouseScroll', 
			Page.onmousewheel.bindAsEventListener(this), false);
	}
	// Safari, IE7, IE6, (and Mozilla).
	Event.myObserve($('page'), 'mousewheel', Page.onmousewheel.bindAsEventListener(this));	

	Event.myObserve(elem, 'mousedown', Page.start_origin_drag.bindAsEventListener(elem));
	
	Object.myExtend(elem, this);
	return elem;
}

// Constants. ////////////////////////////////////

// These constants constrain the page to the viewable area of the screen.
Page.MIN_LEFT_EDGE = -210;
Page.MAX_LEFT_EDGE = 210;
Page.MIN_TOP_EDGE = -148.5;
Page.MAX_TOP_EDGE = 148.5;

Page.ZOOM_PRESETS = [0.1, 0.2, 0.5, 0.8, 1, 2];

// Event handlers. ///////////////////////////////

/** 
 * Return the next highest zoom preset
 */
Page.prototype.get_zoom_in_preset = function()
{
    // Zooming in - Look for the next bigger zoom preset.
	var zoom_in_index = 0;
	var new_zoom = this.get_zoom();

    while (Page.ZOOM_PRESETS[zoom_in_index] <= new_zoom 
        && zoom_in_index < Page.ZOOM_PRESETS.length){
        zoom_in_index += 1;    
    }
    if (zoom_in_index < Page.ZOOM_PRESETS.length){
        new_zoom = Page.ZOOM_PRESETS[zoom_in_index];
    }
    return new_zoom;
}

/**
 * Return the next lower zoom preset.
 */
Page.prototype.get_zoom_out_preset = function(current_zoom)
{
    // Zooming out - Look for the next smaller zoom preset.
	var zoom_out_index = Page.ZOOM_PRESETS.length - 1;
    var new_zoom = this.get_zoom();
    
    while (Page.ZOOM_PRESETS[zoom_out_index] >= new_zoom 
        && zoom_out_index >= 0){
        zoom_out_index -= 1;    
    }
    if (zoom_out_index >= 0){
        new_zoom = Page.ZOOM_PRESETS[zoom_out_index];
    }
    return new_zoom;
}

/**
 * Zoom the page of stikis on scrollwheel.
 * This is the alternative model of zooming suggested by
 * stikis user benmcg
 */
Page.onmousewheel = function Page_onmousewheel(e)
{
    // First, check if we are editing or moving a stiki, or panning the page.
    if (Elem.classCheck(app.edit, 'hidden')
        && ! app.mover.isMoving
        && ! app.zoom_origin.isMoving){    
    	var delta = 0;
    	if (! e) var e = window.event;
    	if (e.wheelDelta){
    		// IE / Opera
    		delta = e.wheelDelta/120;
    		// In opera, the delta differs in sign from IE.
    		if (window.opera){
    			delta = -delta;
    		}
    	}
    	else if (e.detail) {
    		// Mozilla. Sign and multiple are different than IE.
    		delta = -e.detail/3;
    	}	
    		
			new_zoom = delta > 0 ? this.get_zoom_in_preset() : this.get_zoom_out_preset();
    	
    	// Get scroll...
    	var scrollX = (document.documentElement.scrollLeft || document.body.scrollLeft);
    	var scrollY = (document.documentElement.scrollTop || document.body.scrollTop);
    
		// HACK - I have no idea why this works in Firefox, my understanding
        //        of the screenX property is that it shows you your position 
        //        on the screen (ie. the whole monitor). But with firefox, it seems to show the current
        //        cursor position on the page. Also, functions like getPageX(e) and the prototype
        //        Event.pointerX(e) don't seem to work. Nor does e.pageX, which should, by
        //        my reckoning.
		// UPDATE - It seems like this hack is no longer necessary in Fx3, or Sa3 but it's still broken 
		//		  in firefox 2.
        var center_on_x = getPageX(e, 'px').value;
        var center_on_y = getPageY(e, 'px').value;	
		// Distinguish Firefox 2	
        if (Prototype.Browser.Gecko && (! app.page.getBoundingClientRect)){
	        var center_on_x = e.screenX;
	        var center_on_y = e.screenY;
        }
		
        // Only zoom and center if we've got somewhere to zoom to.
        if (new_zoom != this.get_zoom()){
            if (! app.page._is_zooming){
                this.set_zoom_origin(center_on_x, center_on_y);            
                this.set_zoom(new_zoom);
            }
        }
    }    
	Event.stop(e);
}

Page.start_origin_drag = function Page_start_origin_drag(e){
	if (! e) var e = window.event;

	// Decide whether to pan the view, or draw a selection.
	// Only allow dragging if not in the process of zooming.
	if (app.page._is_zooming) return false;

	app.page.reset_zoom_origin();
	if (Elem.classCheck(this, 'selectable')){
		app.page.selection_box.start_draw(e)
	}
	else {
		app.zoom_origin.move(e, [this]);			    
	}
	e.cancelBubble = true;
	return false;
}

Page.prototype.finish_move = function Page_finish_move(e){
	// HACK - This 'click' code has to be here so IE can pick it up.
  if (! app.zoom_origin.hasMoved){
		app.page.selection.clear();
		//app.page.menu.update_size_indicator();	
	}
	return false;
}

// Save related functions /////////////////////////////////

/**
 * This function is called after an Ajax save of the page completes.
 * props can contain an array of properties from the server if it needs
 * to adjust the client side properties of the page.
 * @param {Object} props
 */
Page.prototype.update_complete = function Page_update_complete(props)
{
	Elem.classRemove(document.body, 'dirty');
}

// Accessor functions ////////////////////////////

/**
 * Get the id of the page.
 */
Page.prototype.get_id = function Page_get_id()
{
	var db_id = document.body.id.split('_').last();	
	if (! isNaN(db_id)) db_id = Number(db_id);
    return db_id;
}

/**
 * Set the id of the page.
 */
Page.prototype.set_id = function Page_set_id(new_id)
{
	if (new_id != this.get_id()){
		this.dirty_flags.id = true;
		document.body.id = 'page_' + new_id;
	}
}

/**
 * Return the name of the current page from the url params. 
 * Scans the url params for a kv pair like title=xxx and returns
 * the xxx part.
 * @return A string with the name of the page as given in the url
 * @type String
 */
Page.prototype.get_title = function Page_get_title()
{	
	return document.title;
}

/**
 * Set the title of the page.
 */
Page.prototype.set_title = function Page_set_title(new_title)
{
	if (new_title != this.get_title()){
		this.dirty_flags.title = true;
		document.title = new_title;
	}
}

/**
 * Get the current zoom level for stikis. The percentage
 * is represented as a float where 1.0 = 100%
 * @return {float} The percentage represented as a float.
 */
Page.prototype.get_zoom = function Page_get_zoom()
{
	Function.checkArgs(arguments, ['undefined']);
	
	var fieldZoom = app.zoom_origin.style.fontSize;
	var pageZoom = null;
	var retZoom = null;
	
	if (fieldZoom == ''){
		if (window.getComputedStyle){
			fieldZoom = window.getComputedStyle(app.zoom_origin, '').getPropertyValue('font-size');
		}
		else {
			fieldZoom = app.zoom_origin.currentStyle.fontSize;
		}
	}
	fieldZoom = new CssNumber(fieldZoom);
	
	if (fieldZoom.unit == '%'){
		retZoom = fieldZoom;	
	}
	else {	
		pageZoom = document.body.style.fontSize;
		if (pageZoom == ''){
			if (window.getComputedStyle){
				pageZoom = window.getComputedStyle(document.body, '').getPropertyValue('font-size');
			}
			else {
				pageZoom = document.body.offsetFontSize;
			}
		}
		pageZoom = new CssNumber(pageZoom);
		// Todo - make sure that the units are the same.
		//window.alert('pageZoom: ' + pageZoom + ', fieldZoom: ' + fieldZoom);
		retZoom = new CssNumber((fieldZoom.value)/ pageZoom.value, '%');
	}
	return retZoom.value / 100;
}

/**
 * Set the zoom level for the stiki page. The zoom is represented
 * as an float where 1.0 = 100%
 * @param {Object} newZoom
 */
Page.prototype.set_zoom = function Page_set_zoom(new_zoom)
{
	Function.checkArgs(arguments, ['number']);
	
	var curr_zoom = this.get_zoom();
	
	new_zoom = Math.max(new_zoom, Page.ZOOM_PRESETS[0]);
	new_zoom = Math.min(new_zoom, Page.ZOOM_PRESETS[Page.ZOOM_PRESETS.length - 1]);
	
	if (new_zoom != curr_zoom){
		app.page._is_zooming = true;
		this.dirty_flags.zoom = true;
		
		app.zoom_in_marker.style.left = '-10em';
		app.zoom_in_marker.style.visibility = 'visible';
		
		// Figure out the change in percentage terms	
		var change = 100 * new_zoom / curr_zoom;
		new Effect.Scale(app.zoom_origin, change,
			{
				duration: 0.4,
				afterFinish: function(){
					app.page.menu.zoom_value.innerHTML = Math.round(app.page.get_zoom() * 100);
					app.page.dirty_flags.zoom = true;
					//app.page.reset_zoom_origin();
					app.page.dirty_flags.left_edge = true;
					app.page.dirty_flags.top_edge = true;
					app.page.model.update(app.page, 'zooming');
					app.page._is_zooming = false;
					// HACK: Shock the dom into updating the font size of the stikis.
					app.zoom_origin.removeChild(app.page);
					app.zoom_origin.appendChild(app.page);
					app.zoom_in_marker.style.visibility = '';
					app.zoom_in_marker.style.left = '';
				}	
			}
		);
	}
}

/**
 * Return the left edge of the page. This needs to take account
 * of the fact that the zoom origin might itself be offset from 
 * the center.
 */
Page.prototype.get_left_edge = function Page_get_left_edge()
{
	var zoom_origin_left = Elem.getLeft(app.zoom_origin, 'px').convertTo('em', app.page).value;
	return Math.round_to((Elem.getLeft(this, 'em').value + zoom_origin_left), 2);
}

/**
 * Set the left edge of the page. This needs to take account of the possibility
 * that the zoom origin might be offset from the center.
 * @param {Object} new_left, New left position in ems.
 * @param {Object} zoom_origin_left, (optional) Position of the zoom origin that the left
 *  								 is relative to.
 */
Page.prototype.set_left_edge = function Page_set_left_edge(new_left, zoom_origin_left)
{
	new_left = Math.round_to(new_left, 2);
    if (new_left < Page.MIN_LEFT_EDGE) new_left = Page.MIN_LEFT_EDGE;
    if (new_left > Page.MAX_LEFT_EDGE) new_left = Page.MAX_LEFT_EDGE;
	if (new_left != this.get_left_edge()){
		this.dirty_flags.left_edge = true;
	}	
	if (typeof(zoom_origin_left) != 'undefined'){
		app.zoom_origin.style.left = zoom_origin_left + 'px';
	}
	var zoom_origin_left_ems = Math.round_to(Elem.getLeft(app.zoom_origin, 'px').convertTo('em', app.page).value, 2);
	this.style.left = (new_left - zoom_origin_left_ems) + 'em';
}

/**
 * Return the top edge of the page. This needs to take account of the 
 * fact that the zoom origin might be set elsewhere than the center.
 */
Page.prototype.get_top_edge = function Page_get_top_edge()
{
	var zoom_origin_top = Elem.getTop(app.zoom_origin, 'px').convertTo('em', app.page).value;
	return Math.round_to((Elem.getTop(this).value + zoom_origin_top), 2);
}

/**
 * Set the top edge of the page. This needs to take account of the possibility
 * that the zoom origin might be offset from the center.
 * @param {Number} new_top, New top position in ems.
 * @param {Number} zoom_origin_top, (optional) Postion of the zoom origin that the top 
 * 									is to be relative to. In px.
 */
Page.prototype.set_top_edge = function Page_set_top_edge(new_top, zoom_origin_top)
{
    new_top = Math.round_to(new_top, 2);
	if (new_top < Page.MIN_TOP_EDGE) new_top = Page.MIN_TOP_EDGE;
    if (new_top > Page.MAX_TOP_EDGE) new_top = Page.MAX_TOP_EDGE;
	if (new_top != this.get_top_edge()){
		this.dirty_flags.top_edge = true;
	}
	if (typeof(zoom_origin_top) != 'undefined'){
		app.zoom_origin.style.top = zoom_origin_top + 'px';		
	}
	var zoom_origin_top_ems = Math.round(Elem.getTop(app.zoom_origin, 'px').convertTo('em', app.page).value, 2);
	this.style.top = (new_top - zoom_origin_top_ems) + 'em';		
}

/**
 * Zoom the page by the percentage change specified. Percentage is
 * represented as a float (1.0 = 100%)
 * @param {Object} percentage
 */
Page.prototype.zoom_by = function Page_zoom_by(percentage)
{
	if (percentage != 1){
		this.set_zoom(this.get_zoom() * percentage)
	}
}

/**
 * Center the view on the specified coordinates. Coordinates should be in 'px'.
 */
Page.prototype.center_on = function Page_center_on(x, y)
{
	var parent_width = Elem.getWidth(app.stikis_field, 'px').value;
	var parent_height = Elem.getHeight(app.stikis_field, 'px').value;		
	var deltaX = (parent_width / 2) - x;
	var deltaY = (parent_height / 2) - y;
	var curr_left = Elem.getLeft(app.views.stiki.parent_node, 'em').convertTo('px', app.page).value;
	var curr_top = Elem.getTop(app.views.stiki.parent_node, 'em').convertTo('px', app.page).value;
	var final_left = new CssNumber(curr_left + deltaX, 'px').convertTo('em', app.page).value;
	var final_top = new CssNumber(curr_top + deltaY, 'px').convertTo('em', app.page).value;
		
  // Constrain final x,y to be within the bounds of the page.
  final_left = Math.max(final_left, Page.MIN_LEFT_EDGE);
  final_left = Math.min(final_left, Page.MAX_LEFT_EDGE);
  final_top = Math.max(final_top, Page.MIN_TOP_EDGE);
  final_top = Math.min(final_top, Page.MAX_TOP_EDGE);

	// Place the zoom_in marker on the center coordinates.
	// TODO - should be zoom_out marker if we're zooming out.
	app.zoom_in_marker.style.left = (-final_left - 5) + 'em';	
	app.zoom_in_marker.style.top = (-final_top - 5) + 'em';
	app.zoom_in_marker.style.visibility = 'visible';

	new Effect.MoveEm(app.views.stiki.parent_node, 
		{
			x: final_left, 
			y: final_top, 
			duration: 0.8,
			afterFinish: function(){
				// Figure out what the new left position is...and save it.
				app.page.dirty_flags.left_edge = true;
				app.page.dirty_flags.top_edge = true;
				//app.page.model.update(app.page, 'center_on');
				app.page._is_centering = false;
			}
		}
	);
}

/** 
 * Set the zoom origin back to the center of the screen.
 * @param {Object} x
 * @param {Object} y
 */
Page.prototype.reset_zoom_origin = function()
{
	this.set_left_edge(this.get_left_edge(), 0);
	this.set_top_edge(this.get_top_edge(), 0);
//	var parent_width = Elem.getWidth(app.stikis_field, 'px').value;
//	var parent_height = Elem.getHeight(app.stikis_field, 'px').value;
//	this.set_zoom_origin(parent_width / 2, parent_height / 2);
}

/**
 * Center the view on the specified coordinates. Coordinates should be in 'px'.
 */
Page.prototype.set_zoom_origin = function Page_set_zoom_origin(x, y)
{
	var parent_width = Elem.getWidth(app.stikis_field, 'px').value;
	var parent_height = Elem.getHeight(app.stikis_field, 'px').value;
								
	var new_zoom_left = x - (parent_width / 2);
	var new_zoom_top = y - (parent_height / 2);
		        
    app.page.set_left_edge(app.page.get_left_edge(), new_zoom_left);
    app.page.set_top_edge(app.page.get_top_edge(), new_zoom_top);
}

// Utility functions. ////////////////////////////

/**
 * Nudge the page in the directions specified.
 */
Page.prototype.nudge = function Page_nudge(x, y)
{
    this.set_left_edge(this.get_left_edge() + x);
    this.set_top_edge(this.get_top_edge() + y);
    this.model.update(this, 'nudge');
}

/**
 * Gets a stiki by id. Caches the result for subsequent accesses.
 */
Page.prototype.get_stiki = function Page_get_stiki(stiki_id)
{
	if (! isNaN(stiki_id)) stiki_id = 'stiki_' + stiki_id;
    return (app.page.stikis[stiki_id] || (app.page.stikis[stiki_id] = $(stiki_id)));
}

/**
 * Open the current page in a dedictated browser window, without any browser
 * chrome. 
 */
Page.prototype.open_fullscreen = function()
{
    var p = window.open(window.location, "stikis", "resizable=1");
    if (p.focus)p.focus();
    return void(0);
} 

/** 
 * Create my own move effect to move by ems. This is based on the scriptaculous
 * Move effect.
 */
Effect.MoveEm = Class.create();
Object.extend(Object.extend(Effect.MoveEm.prototype, Effect.Base.prototype), {
  initialize: function(element) {
    this.element = $(element);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'absolute'
    }, arguments[1] || {});
    this.start(options);
  },
  setup: function() {
    // Bug in Opera: Opera returns the "real" position of a static element or
    // relative element that does not have top/left explicitly set.
    // ==> Always set top and left for position relative elements in your stylesheets 
    // (to 0 if you do not need them) 
    //this.element.makePositioned();

    this.originalLeft = Elem.getLeft(this.element, 'em').value;
	this.originalTop = Elem.getTop(this.element, 'em').value;
	
    if(this.options.mode == 'absolute') {
      // absolute movement, so we need to calc deltaX and deltaY
      this.options.x = this.options.x - this.originalLeft;
      this.options.y = this.options.y - this.originalTop;
    }
  },
  update: function(position) {
	var new_left = this.options.x * position + this.originalLeft + 'em';
	var new_top = this.options.y * position + this.originalTop + 'em';
    this.element.setStyle({
      left: new_left,
      top:  new_top
    });
  }
});




/**
 * @fileoverview This class implements the page menu 
 * and associated buttons for the stiki page.
 * 
 * @author Jared Donovan.
 * @version $LastChangedRevision:483 $
 */

function PageMenu(domInstance)
{
	// This class describes the menu for the page. It provides buttons
	// to create stikis, change their color and so on.
	var argPattern = Function.checkArgs(arguments, ['undefined'], ['object']);

	if (argPattern == 1){
		Object.myExtend(domInstance, this);
  
  		domInstance.zoom_value = $('zoom_value');
  
	    AttachButtonHandlers(domInstance,null, 
			function(event){
				event.cancelBubble = true;
			}
	    );
	    
		AttachButtonHandlers($('new_stiki_link'), this,
			this.new_stiki	
		);
		AttachButtonHandlers($('new_stiki_button'), this,
		   null,
		   this.new_stiki
		);
	
		// color palette.
	    AttachButtonHandlers($('color_palette'),null,
	        function color_palette_click(e){
	            if (!e ) var e = window.event;
	            var hsl = update_color(e);
	            this._mousedown = false;
	            app.page.selection.color(hsl);
	            return false;
	        }
,
	    	function color_palette_onmousedown(e){
	            this._mousedown = true;
	            return false;
	        },
	        function color_palette_onmousemove(e){
	            //if (this._mousedown){
	                if (!e ) var e = window.event;
	                update_color(e);
	            //}
	            return false;
	        }
		);
		
	    function update_color(e)
	    {
	        var palette_left = Elem.getLeft($('color_palette'), 'px').value;
	        var palette_top = Elem.getTop($('color_palette'), 'px').value;
	        
	        var x = e.clientX - palette_left;
	        var y = e.clientY - palette_top;
	        
	        var h = x * 3;
	        var s = 90;
	        var l = 90 - y;
	
	        var hsl = 'hsl(' + h + ',' + s + '%,' + l + '%)';
	        
	        //window.alert('hsl: ' + hsl); 
	        
	        app.page.menu.size_indicator.style.backgroundColor = hsl;
	        return hsl;
	    }
	
	    // Color buttons
		var colorPatches = document.getElementsByClassName('color_patch', 'preset_colors');
		for (var i = 0; i < colorPatches.length; i++){
			var colorPatch = colorPatches[i];
            AttachButtonHandlers(
                colorPatch,null, 
                Event.stop,
                function(){
            		var newColor = Elem.getBackgroundColor(this);
            		app.page.menu.size_indicator.style.backgroundColor = newColor;
            		app.page.selection.color(newColor);
                    return false;
                },
                fnFalse,
                fnFalse
            );  			
		}
	
		AttachButtonHandlers($('zoom_out_img'),null,
			function _onclick(e){
				//Function.checkArgs(arguments, ['object'], ['undefined']);
				if (! e) var e = window.event;
				
				if (! app.page._is_zooming){
					app.page.reset_zoom_origin();
                    app.page.set_zoom(app.page.get_zoom_out_preset());
                }
				e.cancelBubble = true;
			}
		);
		
		AttachButtonHandlers($('zoom_in_img'),null,
			function _onclick(e){
				//Function.checkArgs(arguments, ['object'], ['undefined']);
				if (! e) var e = window.event;
				if (! app.page._is_zooming){
					app.page.reset_zoom_origin();
                    app.page.set_zoom(app.page.get_zoom_in_preset());
                }
				e.cancelBubble = true;
			}
		);
	
		AttachButtonHandlers($('delete_button'),null,
			function _onclick(e){
				Function.checkArgs(arguments, ['object'], ['undefined']);
				if (! e) var e = window.event;
				app.page.selection.destroy_all();			
				e.cancelBubble = true;
			}
		);
	
		AttachButtonHandlers($('delete_label'),null,
			function _onclick(e){
				Function.checkArgs(arguments, ['object'], ['undefined']);
				if (! e) var e = window.event;
				app.page.selection.destroy_all();			
				e.cancelBubble = true;
				return false;
			}
		);
		
		AttachButtonHandlers($('pages_expander'),null,
		   function _onclick(e){
		       if (this._expanded){
		           this._expanded = false;
		           this.innerHTML = '+';			   
				   $('pages_scroll_area').style.display = '';	
				          	           
		       }
		       else {
		           this._expanded = true;
		           this.innerHTML = '-';			   
	
	    	       $('pages_scroll_area').style.display = 'block';	       
				   var max_height = app.page.menu.offsetHeight;
				   max_height -= 6 + Position.cumulativeOffset($('pages_scroll_area'))[1];			   
				   $('pages_scroll_area').style.maxHeight = max_height + 'px';
		       }
		   }
		);
		domInstance.size_indicator = $('size_indicator');
		return domInstance;
	}
	return null;
}

PageMenu.prototype.getNewStikiColor = function getNewStikiColor()
{
	// Returns the color that new stikis should be created with.
	return Elem.getBackgroundColor(this._btnNewStiki);
}

PageMenu.prototype.setNewStikiColor = function setNewStikiColor(newColor)
{
	// Sets the stiki color that new stikis should be created with.
	this._btnNewStiki.style.backgroundColor = newColor;
}

/**
 * Update the proportions of the size indicator so they match the current
 * stiki proportions.
 */
PageMenu.prototype.update_size_indicator = function PageMenu_update_size_indicator()
{
	var INDICATOR_WIDTH = 10.8;
	var INDICATOR_HEIGHT = 10.8;
	var MIN_SIZE = 0.5;
	
	var width = INDICATOR_WIDTH;	
	var height = INDICATOR_HEIGHT;
		
	var resized;
		
	var margin_left = 0;
	var margin_top = 0;
	var scale_width = 1;
	var scale_height = 1;
  var current_stiki = app.page.selection.get_current();

	function scale(biggest, smallest, minimum){
		var scale_biggest = 1;
		var scale_smallest = smallest / biggest;
		if (biggest < minimum){
			// Scale the size indicator smaller.
			scale_biggest = biggest / minimum;
			scale_smallest = scale_smallest * scale_biggest;
		}
    biggest = (scale_biggest * INDICATOR_WIDTH);
		smallest = (scale_smallest * INDICATOR_HEIGHT);
		
		biggest = Math.max(MIN_SIZE, biggest);
		smallest = Math.max(MIN_SIZE, smallest);
		 
		return {biggest: biggest, smallest: smallest};
  }		

	if (current_stiki){
	  width = current_stiki.get_width();
    height = current_stiki.get_height();
    if (width >= height){
			scaled = scale(width, height, Stiki.DEFAULT_WIDTH);
			width = scaled.biggest;
			height = scaled.smallest;
    }
    else {
			scaled = scale(height, width, Stiki.DEFAULT_WIDTH);
			height = scaled.biggest;
			width = scaled.smallest;
    }  
    margin_top = ((11 - height) / 2) - 0.1;                    
		margin_left = ((11 - width) / 2) - 0.1;
		
		margin_top = Math.max(margin_top, 0);
		margin_left = Math.max(margin_left, 0);
	}
			
	this.size_indicator.style.width = (width + 'em');
	this.size_indicator.style.height = (height + 'em');
	this.size_indicator.style.marginLeft = (margin_left + 'em');
	this.size_indicator.style.marginTop = (margin_top + 'em');  
}

/**
 * Update the color of the new stiki button with the specified color
 */
PageMenu.prototype.update_color = function PageMenu_update_color(new_color)
{
    app.page.menu.size_indicator.style.backgroundColor = new_color;
}

/**
 * 
 */
PageMenu.prototype.new_stiki = function PageMenu_new_stiki(e){
	Function.checkArgs(arguments, ['object'], ['undefined']);
	if (! e) var e = window.event;
	app.page.reset_zoom_origin();
    var props = {};
	
	function jitter(){
		return 1.5 - (3 * Math.random());
	}
	var offset_left = -Elem.getLeft(app.page, 'em').value + jitter();
	var offset_top = -Elem.getTop(app.page, 'em').value + jitter();

	var current_stiki = app.page.selection.get_current();
	if (current_stiki){
	   props.width = current_stiki.get_width();
	   props.height = current_stiki.get_height();
     offset_left -= props.width / 2;
		 offset_top -= props.height / 2;
	}
	else {
	  offset_left -= Stiki.DEFAULT_WIDTH / 2;
		offset_top -= Stiki.DEFAULT_HEIGHT / 2;
	}

  props.color = Elem.getBackgroundColor(app.page.menu.size_indicator)
	props.left_edge = offset_left;
	props.top_edge = offset_top;

  var new_stiki = app.create('stiki', props, null, ['content']);
  app.page.selection.clear();
	app.page.selection.add(new_stiki);
    
	e.cancelBubble = true;
	return false;
}



//window.alert('PageMenu.js');



/**
 * @fileoverview This script provides a Resizer class, 
 * which the document would inherit, and a ResizeButton class which, 
 * elements that want to be resize controls would inherit.
 * 
 * eg...
 * var resizer = new Resizer(?);
 * new ResizeButton($('elem'), resizer);
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision: 1370 $
 */

/**
 * @constructor 
 * @classDescription Resizer is a class that manages the resizing of
 * 	elements on the page. 
 * @param {Object} resizeSpace
 */
function Resizer(resizeSpace)
{
	var argPattern = Function.checkArgs(arguments, ['undefined'], ['object'])
	
	if (argPattern == 1){
		this.resizeSpace = resizeSpace;
		this.isResizing = false;
		this.cursorWrap = document.createElement('DIV');	
		with (this.cursorWrap){
			offsetX = new CssNumber(0, 'em');
			offsetY = new CssNumber(0, 'em');
			className = "cursorWrap";
			var sfx = 1;
			while ($("cursorWrap_" + sfx)) ++sfx;			
			id = "cursorWrap_" + sfx;
		}
		this.resizeOutline = document.createElement('DIV');	
		with (this.resizeOutline){
			offsetX = new CssNumber(0, 'em');
			offsetY = new CssNumber(0, 'em');
			className = "resizeOutline hidden";
			var sfx = 1;
			while ($("resizeOutline_" + sfx)) ++sfx;	
			id = "resizeOutline_" + sfx;
		}	
		Event.myObserve(document, 'mousemove', Resizer.onmousemove.bindAsEventListener(this));
		Event.myObserve(document, 'mouseup', Resizer.onmouseup.bindAsEventListener(this));
		return this;
	}
	return null;
}

// Event handlers ///////////////////////////////

/**
 * Resizer.onmousemove checks if the resizer is currently
 * resizing. If so, it updates the size and position of the 
 * resize outline and cursorWrap.
 * @param {Object} e
 */
Resizer.onmousemove = function Resizer_onmousemove(e)
{
	Function.checkArgs(arguments, ['object'], ['undefined']);
	if (! e) var e = window.event;

	if (this.isResizing){	
		var eX = getPageX(e);
		var eY = getPageY(e);
		
		var newLeft = eX.subtract(this.cursorWrap.offsetX, this.resizeSpace).value;
		var newTop = eY.subtract(this.cursorWrap.offsetY, this.resizeSpace).value;
		var newWidth = this.origWidth + newLeft;
		var newHeight = this.origHeight + newTop;
		
		// Check that the new size is greater than a minimum.
		if (newWidth < 3) {
			newWidth = 3;
			newLeft = newWidth - this.origLeft;
		}
		if (newHeight < 3) {
			newHeight = 3;
			newTop = newHeight - this.origTop;
		}
		
		
		this.resizeOutline.style.width = newWidth + 'em';				

		//window.alert('newHeight: ' + newHeight);
		this.resizeOutline.style.height = newHeight + 'em'; 				

		this.cursorWrap.style.left = newLeft + 'em'; 
		this.cursorWrap.style.top = newTop + 'em'; 		
	}
}

/**
 * If a resize has just taken place, update the new size back 
 * to the element that was resized. 
 * @param {Object} e
 */
Resizer.onmouseup = function Resizer_onmouseup(e)
{
	Function.checkArgs(arguments, ['object'], ['undefined']);

	if (! e) var e = window.event;
	var dropX = getPageX(e);
	var dropY = getPageY(e);
	
	if (this.isResizing){
		for (var i = 0; i < this.cursorWrap.childNodes.length; i++){
			var elem = this.cursorWrap.childNodes[i];
	
			var newLeft = Elem.getLeft(elem).add(Elem.getLeft(this.cursorWrap), this.resizeSpace);
			var newTop = Elem.getTop(elem).add(Elem.getTop(this.cursorWrap), this.resizeSpace);
			
			Elem.classSwap(elem, 'resizing', 'notResizing');
			
			this.cursorWrap.removeChild(elem);
			this.resizeSpace.appendChild(elem);
			
			elem.style.left = newLeft.toString();
			elem.style.top = newTop.toString();

            var new_width = Elem.getWidth(this.resizeOutline).value
            var new_height = Elem.getHeight(this.resizeOutline).value
            
			this.resizeSpace.set_width(new_width);
			this.resizeSpace.set_height(new_height);	
		}
		this.cursorWrap.style.left = '';
		this.cursorWrap.style.top = '';
		this.resizeOutline.style.width = '';
		this.resizeOutline.style.height = '';
		Elem.classAdd(this.resizeOutline, 'hidden');
		
		
		//this.cursorWrap.removeChild(elem);
		//this.resizeSpace.appendChild(elem);
		this.resizeSpace.removeChild(this.cursorWrap);	
		this.resizeSpace.removeChild(this.resizeOutline);
		this.resizeSpace.onResizeFinished();
		
		this.resizeSpace = null;
	
		this.isResizing = false;
		
		// Force a repaint of the document
		//document.body.style.backgroundColor = '#FFFFFE';
		//window.setTimeout('document.body.style.backgroundColor = "white"', 1); 
	}
}

/**
 * This function is called from elements that are acting as
 * resize buttons to initiate resizing. 
 * @param {Object} e	window.event object.
 * @param {Object} elem	a dom element that is acting as a ResizeButton.
 */
Resizer.prototype.resize = function Resizer_resize(e, elem)
{
	Function.checkArgs(arguments, ['object', 'object']);
	if (! e) var e = window.event;

	// Check that we aren't already resizing, this is to catch 
	// the situation where the user mouses up outside the window.
	if (! this.isResizing){
		this.resizeSpace = elem.parentNode;
		this.resizeSpace.appendChild(this.cursorWrap);
		this.resizeSpace.appendChild(this.resizeOutline);
	
		this.isResizing = true;
		
		// Figure out the position of the resizeable element in ems
		this.origLeft = elem.parentNode.get_width();
		this.origTop = elem.parentNode.get_height();
										
		this.resizeSpace.removeChild(elem);
				
		elem.style.left = this.origLeft + 'em';
		elem.style.top = this.origTop + 'em';

		this.cursorWrap.appendChild(elem);
		
		this.origWidth = this.resizeSpace.get_width();
		this.origHeight = this.resizeSpace.get_height();

		this.resizeOutline.style.width = this.origWidth + 'em';
		this.resizeOutline.style.height = this.origHeight + 'em';
		Elem.classRemove(this.resizeOutline, 'hidden');	

		this.cursorWrap.offsetX = getPageX(e);
		this.cursorWrap.offsetY = getPageY(e);
	}		
}

/**
 * @constructor  
 * @classDescription ResizeButton class is a class for wrapping dom elements
 * 	so they can act as resize controls.
 * @param {Object} domElem
 * @param {Object} resizer
 */

function ResizeButton(domElem, resizer)
{
	var argPattern = Function.checkArgs(arguments, ['undefined'], ['object', 'object']);
	
	if (argPattern == 1){
		Object.myExtend(domElem, this);
		domElem.resizer = resizer;
		//domElem.className += " resizeable notResizing";
		Event.myObserve(domElem, 'mousedown', ResizeButton.onmousedown.bindAsEventListener(domElem));
		return domElem;
	}
}

/**
 * Start resizing.
 * @param {Object} e
 */
ResizeButton.onmousedown = function ResizeButton_onmousedown(e)
{
	Function.checkArgs(arguments, ['object'], ['undefined'])
	
	if (!e) var e = window.event;

	Elem.classSwap(this, 'notResizing', 'resizing');
	this.resizer.resize(e, this);
	e.cancelBubble = true;
}



/**
 * @fileoverview This file defines functions for allowing selection
 * of items on a page.
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision: 1790 $
 */

/**
 * First, add some keycodes that aren't defined in prototype.
 */
 
// Correct for Quirk that apple key gives a different code between Fx & Sa
if(Prototype.Browser.Gecko){
	Event.KEY_APPLE_LEFT = 224;
	Event.KEY_APPLE_RIGHT = 224;
}	
else if(Prototype.Browser.Opera){
	Event.KEY_APPLE_LEFT = 17;
	Event.KEY_APPLE_RIGHT = 17;
//	Event.KEY_CTL = 0; ??? Can this be true?
}
else { 
	// Safari
	Event.KEY_APPLE_LEFT = 91;
	Event.KEY_APPLE_RIGHT = 93;
}

Event.KEY_CTL = 17;
Event.KEY_ALT = 18;
Event.KEY_SPACE = 32;
Event.KEY_TAB = 9;

// Event.KEY_ESC = 27;

/**
 * Keep track of whether the user has pressed CTL.
 * TODO: This has expanded to take notice of other keys too. It should
 * be moved out of this file into the 'Page' file instead.
 */
function document_onkeydown(e)
{
	if(app && app.page){		
		if (! e) var e = window.event;
		// HACK - This should be done somewhere centrally.
		//		  I believe prototype 1.5.1 has this in Prototype.Browser object,
		//		  but I'm still on 1.5.0
		//		  If the user has set their user agent to report a different os
		//		  then there isn't much I can do to help them. However, the 
		//		  selection function will still work, but with the annoying 
		//		  contextual menu pop-up bug.		
			
		if (navigator.platform.match(/^Mac/)){		
			if (e.keyCode == Event.KEY_APPLE_LEFT || e.keyCode == Event.KEY_APPLE_RIGHT){
				document.ctl = true;
				Elem.classAdd(app.page, 'selectable');			
			}
		}
		else {
			if (e.keyCode == Event.KEY_CTL){
				document.ctl = true;
				Elem.classAdd(app.page, 'selectable');			
			}
		}
		
		switch (e.keyCode){
	    case Event.KEY_LEFT:
				if (e.ctrlKey && e.shiftKey){
					app.page.selection.chuck_left();
					Event.stop(e);
					return false;
				}
				else if (e.shiftKey){                    
					app.page.nudge(-16, 0);
					Event.stop(e);
					return false;
				}
				else if (e.ctrlKey){
					app.page.selection.nudge(-8, 0);
					Event.stop(e);
				}
				else {
					app.page.selection.nudge(-0.2,0, e);
				}
				break;		  
			case Event.KEY_RIGHT:
				if (e.ctrlKey && e.shiftKey){
					app.page.selection.chuck_right();
					Event.stop(e);
				}
				else if (e.shiftKey){                   
					app.page.nudge(16, 0);
					Event.stop(e);
					return false;
				}
				else if (e.ctrlKey){
					app.page.selection.nudge(8, 0);
					Event.stop(e);
				}
				else {
					app.page.selection.nudge(0.2,0, e);
				}
				break;
			case Event.KEY_UP:
				if (e.ctrlKey && e.shiftKey){
					app.page.selection.chuck_up();
					Event.stop(e);
				}
				else if (e.shiftKey){                    
					app.page.nudge(0, -16);
					Event.stop(e);
					return false;
				}
				else if (e.ctrlKey){
					app.page.selection.nudge(0, -8);
					Event.stop(e);
				}
				else {
					app.page.selection.nudge(0,-0.2, e);
				}
				break;
			case Event.KEY_DOWN:
				if (e.ctrlKey && e.shiftKey){
					app.page.selection.chuck_down();
					Event.stop(e);
				}
				else if (e.shiftKey){                  
					app.page.nudge(0, 16);
					Event.stop(e);
					return false;
				}
				else if (e.ctrlKey){
					app.page.selection.nudge(0, 8);
					Event.stop(e);
				}
				else {
					app.page.selection.nudge(0,0.2, e);
				}
				break;
			case Event.KEY_ESC:									
				app.edit.save_and_close();
				break;
			case Event.KEY_DELETE:									
				if (! app.edit.stiki){
					app.page.selection.destroy_all();
				}
				break;
			case 86:									// CTL + V
				if (e.ctrlKey){
					var current_stiki = app.page.selection.get_current();
					if (current_stiki){
						app.page.menu.new_stiki(e, current_stiki.get_left_edge(), current_stiki.get_top_edge());
					}
					else {
						app.page.menu.new_stiki(e);
					}
				}
				break;
	/*
			default:
				window.alert('e.keyCode: ' + e.keyCode);
				break;
	*/
		}
	}
}

function initializeKeyboardShortCuts(){	
	Event.myObserve(document, 'keydown', document_onkeydown.bindAsEventListener(document));			// TODO - would it be better to use 'window' here?
		
	function document_onkeyup(e){
		document.ctl = false;
		if (app && app.page){
			Elem.classRemove(app.page, 'selectable');		
		}
	}
	Event.myObserve(document, 'keyup', document_onkeyup.bindAsEventListener(document));

	// HACK - I have to jump through some hoops to detect when IE 
	// window truly loses focus.	
	function selector_cancel_selection(){
		document.ctl = false;
		if (app && app.page) {
			Elem.classRemove(app.page, 'selectable');	
		}
	}	

	function window_onFocusOut(){
		if (window._activeElement != document.activeElement){
			window._activeElement = document.activeElement;
		}
		else {
			selector_cancel_selection();
		}
	}
	window._activeElement = document.activeElement;

	if (Prototype.Browser.IE) {
		Event.myObserve(document, 'focusout', window_onFocusOut);
	}
	else {
		Event.myObserve(window, 'blur', selector_cancel_selection);		
	}
	// END HACK
	
	document.ctl = false;
}


/**
 * Class to manage selections.
 */
function Selection(){
	var ret_array = [];
	
	Object.extend(ret_array, this);    
	ret_array._current = null;
	
	return ret_array;
}

/**
 * Return an array of the ids of the stikis that the selection contains.
 */
Selection.prototype.get_stiki_ids = function Selection_get_stiki_ids()
{
	var ret_array = [];
	for(var i = 0; i < this.length; i++){
		ret_array.push(this[i].id);
	}
	return ret_array;
}

/**
 *
 */
Selection.prototype.get_left_edge = function Selection_get_left_edge()
{
	return this.min(
	  function(stiki){
	    return stiki.get_left_edge();
	  }
	);
}

Selection.prototype.get_right_edge = function Selection_get_right_edge()
{
	return this.max(
	  function(stiki){
	    return stiki.get_left_edge() + stiki.get_width();
	  }
	);
}

/**
 *
 */
Selection.prototype.get_top_edge = function Selection_get_top_edge()
{
	return this.min(
	  function(stiki){
	    return stiki.get_top_edge();
	  }
	);
}

/**
 *
 */
Selection.prototype.get_bottom_edge = function Selection_get_bottom_edge()
{
	return this.max(
	  function(stiki){
	    return stiki.get_top_edge() + stiki.get_height();
	  }
	);
}

/**
 *
 */
Selection.prototype.get_width = function Selection_get_width()
{
	return this.get_right_edge() - this.get_left_edge();
}

/**
 *
 */
Selection.prototype.get_height = function Selection_get_height()
{
  return this.get_bottom_edge() - this.get_top_edge();
}

/**
 * Get the cumulative width of all the stikis in the selection.
 * This is used in spacing stikis horizontally.
 * @return float The cumulative width.
 */
Selection.prototype.get_contained_width = function Selection_get_contained_width()
{
	var total_width = 0;
	for (var i = 0; i < this.length; i++){
		total_width += this[i].get_width();
	}
	return total_width;
}

/**
 * Get the cumulative height of all the stikis in the selection.
 * This is used in spacing stikis vertically.
 */
Selection.prototype.get_contained_height = function Selection_get_contained_height()
{
	var total_height = 0;
	for (var i = 0; i < this.length; i++){
		total_height += this[i].get_height();
	}
	return total_height;
}

/**
 * @return Stiki the current stiki in the selection.
 */
Selection.prototype.get_current = function Selection_get_current()
{
	return this._current;
}

/**
 * Set the specified stiki to be the current stiki in the selection.
 * @param {Object} stiki
 */
Selection.prototype.set_current = function Selection_set_current(stiki)
{
	if (this._current){
		this._current.set_is_current(false);
	}
	this._current = stiki;
	if (stiki) stiki.set_is_current(true);
	app.page.menu.update_size_indicator();
}

/** 
 * Return true if the selection contains the specified stiki, false otherwise.
 * @param {Object} stiki The stiki to check for.
 */
Selection.prototype.contains = function Selection_contains(stiki){
	for(var i = 0; i < this.length; i++){
		if (this[i].id == stiki.id) {
			return true;
		}
	}
	return false;
}

/**
 * Adds the specified stiki to the selection.
 * @param {Object} stiki
 */
Selection.prototype.add = function Selection_add(stiki, do_maintain_selection, force_add)
{
	// TODO - How should the z-index be updated in each of these cases?
	
	// Add the specified stiki to the current selection.
	
	// Check for CTL+click, this allows users to select multiple items by 
	// holding down the control key when they click.
	if (document.ctl || do_maintain_selection) {
		// CTL + click.
		// Now check whether the stiki to add was already selected, 
		if (stiki.get_is_selected() && ! force_add){
			// In this case, CTL+click should remove the stiki from the selection.
			this.remove(stiki);
		}
		else {
			// The 'normal' case, the stiki should be added to the selection and set
			// to be the current stiki.
			// Check that the stiki is not already in the selection
			if (! stiki.get_is_selected()){
				this.push(stiki);
				// HACK - Just set it to the current time in milliseconds.
				stiki.bring_to_front();
				stiki.set_is_selected(true);	
			}	
			this.set_current(stiki);
		}
	}
	else {
		// Check if the stikis already selected
		if (! stiki.get_is_selected()){
			// Then we should start a new selection	
			this.clear();
			this.push(stiki);
			// HACK - Just set it to the current time in milliseconds.
			stiki.bring_to_front();
			stiki.set_is_selected(true);
			this.set_current(stiki); 
		}
	}
}	

/**
 * Remove the specified stiki from the selection.
 * @param {Object} stiki
 */
Selection.prototype.remove = function Selection_remove(stiki)
{
	var tmp = this.without(stiki);
	this.length = 0;
	for (var i = 0; i < tmp.length; i++){
		this.push(tmp[i]);
	}
	//while(tmp.length > 0) this.push(tmp.pop());
	if (stiki.get_is_current()) this.set_current(this.last());
	stiki.set_is_selected(false);
}

/**
 * Clear any current selection.
 */
Selection.prototype.clear = function Selection_clear()
{
	while (this.length > 0){
		this.pop().set_is_selected(false);
	}
	this.set_current(null);
}

/**
 * Update all the stikis in the selection.
 */
Selection.prototype.update_all = function Selection_update_all(reason)
{
	if (this.length > 0){
		app.models.stiki.update_group(this, reason || "Group update.");		
	}
}

/**
 * Delete all the stikis currently in the selection
 */
Selection.prototype.destroy_all = function Selection_destroy_all()
{
	// Delete any currently selected stikis.
	this.each(function(stiki){
			stiki.model.destroy(stiki);
		}
	);
	this.clear();
}

/**
 * Combine all the currently selected stikis into one big stiki.
 */
Selection.prototype.combine = function Selection_combine()
{
	var inner_HTML = ''
	
	if (this.length > 1){	
		this.each(function(stiki){
				inner_HTML += stiki.get_inner_HTML() + '<p></p>';
			}
		);
	
		var combined = {
			color: this.get_current().get_color(),
			left_edge: this.get_left_edge(),
			top_edge: this.get_top_edge(),
			width: this.get_width(),
			height: this.get_height(),
			inner_HTML: inner_HTML
		};
		
		this.destroy_all();
		new Stiki(combined);
	}
}

/**
 * Make all the selected stikis the same size as the current stiki.
 */
Selection.prototype.make_same_size = function Selection_make_same_size()
{
	var same_width = this.get_current().get_width();
	var same_height = this.get_current().get_height();	
	this.invoke('set_width', same_width);
	this.invoke('set_height', same_height);
	this.update_all('Make same size');
}

/**
 * Send the selected stikis to the specified new page.
 * @param {Object} page_id
 */
Selection.prototype.repage = function Selection_repage(page_id)
{
	this.invoke('repage', page_id);
}

Selection.prototype.color = function Selection_color(color)
{
	this.invoke('set_color', color);
	this.update_all('Selection color');
}

/**
 * Align all the selected stikis to the left position of the 
 * current stiki
 */
Selection.prototype.align_left = function Selection_align_left()
{	
	var left_edge = this.get_left_edge();
	this.invoke('set_left_edge', left_edge);
	this.update_all('Align Left');	
}

/**
 * Align all the selected stikis to the top position of the 
 */
Selection.prototype.align_top = function Selection_align_top()
{	
	var top_edge = this.get_top_edge();
	this.invoke('set_top_edge', top_edge);
	this.update_all('Align Top');	
}

/**
 * Distribute the selected items horizontally.
 */
Selection.prototype.space_left_right = function Selection_space_left_right()
{
	if (this.length > 2){	    
		this.sort(
			function(l, r){
				return l.get_left_edge() - r.get_left_edge();
			}
		);
		
		var space_available = this.get_width() - this.get_contained_width();
		var spacing = space_available / (this.length - 1);
		var spaced_left = this.get_left_edge() + this.first().get_width() + spacing;

		for (var i = 1; i < this.length - 1; i++){
			stiki = this[i];
			stiki.set_left_edge(spaced_left);
			stiki.bring_to_front();
			spaced_left += stiki.get_width() + spacing;
		}
		this.update_all('Spage Left-Right.');
	}
	this.last().bring_to_front();
}

/**
 * Distribute the selected items vertically.
 */
Selection.prototype.space_up_down = function Selection_space_up_down()
{
	if (this.length > 2){	    
		this.sort(
			function(t, b){
				return t.get_top_edge() - b.get_top_edge();
			}
		);
		
		var space_available = this.get_height() - this.get_contained_height();
		var spacing = space_available / (this.length - 1);
		var spaced_top = this.get_top_edge() + this.first().get_height() + spacing;

		for (var i = 1; i < this.length - 1; i++){
			stiki = this[i];
			stiki.set_top_edge(spaced_top);
			stiki.bring_to_front();
			spaced_top += stiki.get_height() + spacing;
		}
		this.update_all('Spage Up Down.');
	}
	this.last().bring_to_front();
}

/**
 * 'Nudge' all stikis in the selection by the amounts specified.
 */
Selection.prototype.nudge = function Selection_nudge(x, y, e)
{
	if (this.length > 0){
		if (e) Event.stop(e);
		this.each(
			function(stiki){
				stiki.set_left_edge(stiki.get_left_edge() + x);
				stiki.set_top_edge(stiki.get_top_edge() + y)
			}
		);
		this.update_all('Nudge');
	}
}

/** 
 * Chuck the stikis to the specified side.
 */
Selection.prototype.chuck_left = function Selection_chuck_left()
{
	for (var i = 0; i < this.length; i++){
		var stiki = this[i];
		stiki.move_to(Stiki.MIN_LEFT_EDGE - stiki.get_width(), stiki.get_top_edge());        
	}
}

Selection.prototype.chuck_right = function Selection_chuck_right()
{
	for (var i = 0; i < this.length; i++){
		var stiki = this[i];
		stiki.move_to(Stiki.MAX_LEFT_EDGE, stiki.get_top_edge()); 
	}
}

Selection.prototype.chuck_up = function Selection_chuck_up()
{
	for (var i = 0; i < this.length; i++){
		var stiki = this[i];
		stiki.move_to(stiki.get_left_edge(), Stiki.MIN_TOP_EDGE - stiki.get_height());        
	}
}

Selection.prototype.chuck_down = function Selection_chuck_down()
{
	for (var i = 0; i < this.length; i++){
		var stiki = this[i];
		stiki.move_to(stiki.get_left_edge(), Stiki.MAX_TOP_EDGE);        
	}
}

/**
 * Class to create a widget to allow selection of elements
 * by drawing a 'marquee' on the page.
 */
function SelectionBox(dom_parent)
{
	var div = $('selection_box_1');
	Object.myExtend(div, this);
	
	Event.myObserve(dom_parent, 'mousemove', SelectionBox.onmousemove.bindAsEventListener(div));
	Event.myObserve(dom_parent, 'mouseup', SelectionBox.onmouseup.bindAsEventListener(div));
		
	return div;
}

/**
 * Start drawing the selection.
 */
SelectionBox.prototype.start_draw = function SelectionBox_start_draw(e)
{
	app.page.selection_box.start_x = getPageX(e, 'px').value;
	app.page.selection_box.start_y = getPageY(e, 'px').value;
	app.page.selection_box.style.left = this.start_x + 'px';
	app.page.selection_box.style.top = this.start_y + 'px';

	Elem.classAdd(this, 'selecting');
	app.page.selection_box._selecting = true;

	// Make sure that the window keeps focus.
	// This is so Firefox will get the document keyup event.
	window.focus();

	return false;
}

/**
 * While drawing the selection, update the size of the select box
 * as the mouse moves. This event should be bound to the selection
 * box's dom parent.
 */
SelectionBox.onmousemove = function SelectionBox_onmousemove(e)
{
	e = e || window.event;	
	if (app.page.selection_box._selecting){
		var x = getPageX(e, 'px').value;
		var y = getPageY(e, 'px').value;
		app.page.selection_box.update_size(x, y);    
	}
	return false;
}

/**
 * When the user lifts the mouse button, the selection box needs
 * to figure out which stikis it has selected. This event should be 
 * bound to the selection box's dom parent.
 */
SelectionBox.onmouseup = function SelectionBox_onmouseup(e)
{
	e = e || window.event;
	if (app.page.selection_box._selecting){		
		// Clear any current selection before creating another one, unless the user
		// holds down the shift key.
		if(! e.shiftKey){
			app.page.selection.clear()			
		}
		
		app.page.selection_box.calculate_selection(e);
		
		Element.setStyle(app.page.selection_box, {left: '', top: '', width: '', height: ''});
		Elem.classRemove(app.page.selection_box, 'selecting');		
		app.page.selection_box._selecting = false;
		// Update the z-index of any stikis that were selected.
		app.page.selection.update_all('Selection Box');
	}		
	
	// HACK - Make sure that the window keeps focus.
	// 				This is so Firefox will get the document keyup event.
	//        ...but only do it if the edit pane is not visible, because
	//        that will upset IE!
	if (Elem.classCheck(app.edit, 'hidden')){
		window.focus();		
	}
	return false;
}

/**
 * Update the size of the selection box based on the coordinates of the
 * supplied event object.
 */
SelectionBox.prototype.update_size = function SelectionBox_update_size(x, y)
{
	var left = Math.min(this.start_x, x);
	var width = Math.abs(this.start_x - x);
	var top = Math.min(this.start_y, y);
	var height = Math.abs(this.start_y - y);

	this.style.left = left + 'px';
	this.style.width = width + 'px';
	this.style.top = top + 'px';
	this.style.height = height + 'px';
}

/**
 * Calculate what stikis are contained in the selection 
 */
SelectionBox.prototype.calculate_selection = function SelectionBox_calculate_selection(e)
{
	// First, try drawing a div in the pan_origin that lines up with the selection box
	// we've just drawn in the body.
	var origin_left = Elem.getWidth(app.stikis_field, 'px').value / 2;
	var origin_top = Elem.getHeight(app.stikis_field, 'px').value / 2;
	var page_left = new CssNumber(app.page.get_left_edge(), 'em').convertTo('px', app.page).value;
	var page_top = new CssNumber(app.page.get_top_edge(), 'em').convertTo('px', app.page).value; 
	
	var left = this.offsetLeft;
	left -= origin_left;
	left -= page_left;
	
	var top = this.offsetTop;
	top -= origin_top;       
	top -= page_top;         
	
	var width = this.style.width;
	var height = this.style.height;
	
	// Guard against unparseable width/height.
	if (width == '') {
  	width = "0px";
  }
	if (height == ''){
		height = "0px";
	}

	// Now convert dimensions into ems, 
	left = new CssNumber(left, 'px').convertTo('em', app.page).value;
	top = new CssNumber(top, 'px').convertTo('em', app.page).value;
	
	width = new CssNumber(width).convertTo('em', app.page).value;
	height = new CssNumber(height).convertTo('em', app.page).value;
	
	var right = left + width;
	var bottom = top + height;
	
	// HACK - IE, collect an array of ids of stikis to 
	//        select and do this via a timeout.
	var selected_stikis = []; // app.page.selection.id_array();
	
	// Determine whether the given stiki overlaps the selection
	// coordinates defined above.
	var does_overlap = function(stiki){
		var stiki_left = new CssNumber(stiki.style.left).value;
		var stiki_top = new CssNumber(stiki.style.top).value;
		var stiki_right = stiki_left + new CssNumber(stiki.style.width).value;
		var stiki_bottom = stiki_top + new CssNumber(stiki.style.height).value;
		
		var horizontal_selected = (stiki_left < right) && (stiki_right > left);
		var vertical_selected = (stiki_top < bottom) && (stiki_bottom > top);
		var is_selected = horizontal_selected && vertical_selected;
		//window.alert('stiki: ' + stiki.id + ', is_selected: ' + is_selected);
		return is_selected;
	}
	
	var stikis = document.getElementsByClassName('stiki');
	for (var i = 0; i < stikis.length; i++){
	  var stiki = stikis[i];
		if ((stiki.id != 'stiki_template') 
			&& does_overlap(stiki)){
			selected_stikis.push(stiki.id); 
		}
	}
	
	for (var i = 0; i < selected_stikis.length; i++){
		var stiki = $(selected_stikis[i]);
		if (! stiki.model){
			// Remove the 'onmouse' handler from the stiki and attach it.
			if(stiki.onmousedown){
				stiki.onmousedown = "";
			}
			app.attach(stiki);			
		} 
		app.page.selection.add(stiki, true, true);
	}
}


/**
 * @fileoverview Class for a stiki control. A moveable div in which 
 * a user can make notes.
 * 
 * @author Jared Donovan
 * @version $LastChangedRevision:483 $
 */
 
/**
 * Constructor for stiki class.
 */	
function Stiki(elem, model) 
{
	var argPattern = Function.checkArgs(arguments, 
	  ['undefined'], 
	  ['object', 'object']
	);
		
	if (argPattern == 1){
		// Wrap to an existing element.
		this.model = model;
		Object.myExtend(elem, this);
		
		elem.dirty_flags = {};
		
		// Initialisation of the object.
		
		if (! app.options.as_demo){
			// Edit button
			var edit_button = document.createElement('div');
			edit_button.className = 'edit_button';
			edit_button.id = elem.id + '_edit_button';
			edit_button.title = 'Edit this stiki';
			edit_button.onmousedown = function(e){Event.stop(e || window.event);};
			elem.appendChild(edit_button);			

			// Expander
			var expander = document.createElement('div');
			expander.className = 'expander';
			expander.id = elem.id + '_expander';
			var fit_to_contents = document.createElement('div');
			fit_to_contents.className = 'fit_to_contents';
			fit_to_contents.title = 'More...';
			var restore_size = document.createElement('div');
			restore_size.className = 'restore_size';
			restore_size.title = 'Restore size';
			expander.appendChild(fit_to_contents);
			expander.appendChild(restore_size);
			elem.appendChild(expander);
		}
        
		// Resize button
		elem._resize_button = document.createElement('div');
		elem._resize_button.className = 'resize_button';
		elem._resize_button.id = elem.id + '_resize_button';
		elem._resize_button.innerHTML = '<div	title="Click and drag to resize" onmousedown="return false;"></div>'
		elem._resize_button.ondblclick = function(e){Event.stop(e || window.event);};
		elem.appendChild(elem._resize_button);       
        
		// Dirty marker
		elem._dirty_marker = document.createElement('div');
		elem._dirty_marker.className = 'dirty_marker';
		elem._dirty_marker.innerHTML = '<img src="/images/save_in_progress.gif" onmousedown="Event.stop(event);">';
		elem.appendChild(elem._dirty_marker);
		        
		// Get references to other parts of the stiki.
		elem._halo = $(elem.id + '_halo');
		elem._contents_div = $(elem.id + '_contents');
    	
		// Hook up all of the contents and remove child nodes that  are not contents. 
		elem.contents = [];

		var contentNodes = elem._contents_div.childNodes;
		for (var i = 0; i < contentNodes.length; i++){
      var node = contentNodes[i];
      if (Elem.classCheck(node, 'content')){
        app.attach(node, {stiki_id: elem.get_id()});
				elem.contents.push(node);
			
				// Todo - here we need to figure out if the
				// node is new, or if a corresponding object
				// already exists on the server.
				// HACK - For now, I'll look for '_new_' in the id.
				if (/_new_/.test(node.id)){
					node.is_saving = true;            
				}
			}
		}		
		    
		// Attach event handlers.
  	if (! app.options.as_demo){
			AttachButtonHandlers(edit_button, null,
				function(e){
					var e = e || window.event;
					elem.edit(e);
				}
			)    	
			Event.myObserve(elem, 'dblclick', elem.edit.bindAsEventListener(elem));	    

			// Expand/collapse buttons.
			AttachButtonHandlers(fit_to_contents, elem,
				elem.fit_to_contents
			);
			AttachButtonHandlers(restore_size, elem,
				elem.restore_size
			);
	    	
			// Check whether there is an overflow, so we can 
			// know whether to show the collapse button.
			elem.check_overflow();
		}

		// Resize button.	
		new ResizeButton(elem._resize_button, app.resizer);
		
		Event.myObserve(elem, 'mousedown', Stiki.onmousedown.bindAsEventListener(elem));	    
				
		try{
			Element.setOpacity(elem._halo, 0.25);	
		}catch(e){
			// IE throws an error when doing this for a newly created stiki.
		}
		Elem.classAdd(elem, 'enabled');	

		return elem;
	}
	return null;
}

// Static methods ////////////////////////////////

// TODO: Could these default values be returned by the
//       /application/models.js resource?
Stiki.DEFAULT_WIDTH = 12;
Stiki.DEFAULT_HEIGHT = 12;
Stiki.MIN_LEFT_EDGE = -213;
Stiki.MAX_LEFT_EDGE = 213;
Stiki.MIN_TOP_EDGE = -151.5;
Stiki.MAX_TOP_EDGE = 151.5;
Stiki.MIN_WIDTH = 3;
Stiki.MIN_HEIGHT = 3;
Stiki.HALO_BORDER = 4;

// Attributes ////////////////////////////////////
		
Stiki.prototype.is_saving = false;
Stiki.prototype.is_save_pending = false;
Stiki.prototype._extraChecks = ['selected'];

// Event handlers ////////////////////////////////

Stiki.onmousedown = function Stiki_onmousedown(e)
{
	//Function.checkArgs(arguments, ['object'], ['undefined']);
	if (! e) var e = window.event;
	
	if (Elem.classCheck(this, 'enabled')){
		//debugger;
		/*
		// TODO - IE6 *still* throws an error here for newly created stikis!
		try{
			this._halo.setOpacity(0.5);
		}
		catch (e){
			//window.alert('error');
		}
		*/
		app.page.selection.add(this);
		
		// Update the color/size for new stikis. 
		app.page.menu.update_color(this.get_color());
		
		//
		// Move the stiki.
		//
		
		// Check whether there are any extra checks to perform before letting the element move
		var passExtraChecks = true;
		if (this._extraChecks){
			for (var i = 0; i < this._extraChecks.length; i++){			
				passExtraChecks &= Elem.classCheck(this, this._extraChecks[i]);
			}
		}
		if (passExtraChecks){
			app.mover.move(e, app.page.selection);			
			e.cancelBubble = true;
		}
	}

	// Cancel event bubbling so the stiki doesn't get unselected.
	e.cancelBubble = true;
	return false;
}

/**
 * Call when the stiki has finished resizing so the stiki can 
 * save itself and update the page menu size indicator.
 */
Stiki.prototype.onResizeFinished = function Stiki_onResizeFinished()
{
	//Function.checkArgs(arguments, ['undefined']);
	app.page.menu.update_size_indicator();
	this.model.update(this, 'Resize');
	this.redraw();
}

/**
 * Force the stiki to redraw itself (used in IE6).
 */
Stiki.prototype.redraw = function Stiki_redraw()
{
	Elem.classAdd(this, 'redraw');
	Elem.classRemove(this, 'redraw');	
}

/**
 * When stikis are first created, fade them in so they look nice,
 * and add them to the selection so we can do something with them.
 */
Stiki.prototype.create_start = function Stiki_create_start()
{
	Element.setOpacity(this, 0);
	this.style.visibility = 'visible'; 
	   
	Effect.Fade(this, { 
			duration: 0.8, 
			from: 0, 
			to: 1, 
			queue: {
				position: 'front', 
				scope: this.id
			}
		}
	);
}

/**
 * When stikis creation is completed, we expect that the server will have
 * sent us details of the content to add to the stiki.
 */
Stiki.prototype.create_complete = function Stiki_create_complete(response, json_response)
{
	// Now we should have the id for the first piece of content back.
	var first_content = this.contents[0];
		
	first_content.model.create_complete(first_content, null, {attributes: json_response.associated.content});
	
	/*
	for (var k in json_response.associated.content){
		var setter = 'set_' + k;
		if (typeof(first_content[setter]) == 'function'){
			first_content[setter](json_response.associated.content[k]);
		}	
	}
	if (first_content.save_pending){
	
	}
	*/	
}

/**
 * Delete a stiki from the server and remove it from the page.
 */
Stiki.prototype.destroy_start = function Stiki_destroy_start()
{
	// We fade the stiki out all the way immediately
	// and disable the stiki, but we only actually 
	// issue the ajax request to destroy the stiki when
	// the pending saves have responded. 
	this.set_is_selected(false);
	this.set_is_current(false);
	Elem.classRemove(this, 'enabled');
	
	//Element.setOpacity(this, 0.5);
	//var this_id = this.id;
	Effect.Fade(this.id, { 
	    duration: 0.8, 
	    from: 1, 
	    to: 0,
	    queue: {
	      position: 'front', 
	      scope: this.id
	    }
	  }
	);        
}

// Accessors /////////////////////////////////////

/**
 * Return the unique identifier for the stiki in the database.
 * The identifier is stored in the stikis as a proprietry attribute.
 * @type Number
 */
Stiki.prototype.get_id = function Stiki_get_id(){
	var dbId = this.id.split('_').last();
	if (! isNaN(dbId)){
		dbId = Number(dbId);		
	} 
	return dbId;
}

/**
 * Set the unique identifier for the stiki in the database.
 * @argument {Number} new_id The id to use for the dbId.
 * @return null
 */
Stiki.prototype.set_id = function Stiki_set_id(new_id)
{
	Function.checkArgs(arguments, ['number']);	
	
	if (new_id != this.get_id()){
		this.id = 'stiki_' + new_id;
		// TODO - I probably also need to go through and change all 
		//        the ids of the child elements?
	}
}

/**
 * Get the page_id for the stiki.
 */
Stiki.prototype.get_page_id = function Stiki_get_page_id()
{
	if (this.page_id){
		return this.page_id;
	}
	else {
		return app.page.get_id();
	}
}

/**
 * Set the page_id for the stiki. Setting the page id for the
 * stiki effectively sends the stiki to the new page.
 */
Stiki.prototype.set_page_id = function Stiki_set_page_id(new_id)
{
	if (new_id != this.get_page_id()){
		this.dirty_flags.page_id = true;
		this.page_id = new_id;
	}	
}

/**
 * Get the left edge of the stiki
 */
Stiki.prototype.get_left_edge = function Stiki_get_left_edge()
{
	return Math.round_to(Elem.getLeft(this, 'em').value, 2);
}

/**
 * Set the left edge of the stiki
 */
Stiki.prototype.set_left_edge = function Stiki_set_left_edge(new_left){
	new_left = Math.round_to(new_left, 2);
	if (new_left + this.get_width() < Stiki.MIN_LEFT_EDGE){ 
		new_left = Stiki.MIN_LEFT_EDGE - this.get_width();
	}
	new_left = Math.min(Stiki.MAX_LEFT_EDGE, new_left);

  if (new_left != this.get_left_edge()){
	  this.dirty_flags.left_edge = true;
	}
	this.style.left = new_left + 'em';
}

/**
 * Get the top_edge of the stiki
 */
Stiki.prototype.get_top_edge = function Stiki_get_top_edge()
{
	return Math.round_to(Elem.getTop(this, 'em').value, 2);
}

/**
 * Set the left edge of the stiki
 */
Stiki.prototype.set_top_edge = function Stiki_set_top_edge(new_top)
{
	new_top = Math.round_to(new_top, 2);
	if (new_top + this.get_height() < Stiki.MIN_TOP_EDGE){
		new_top = Stiki.MIN_TOP_EDGE - this.get_height();		
	} 
	new_top = Math.min(Stiki.MAX_TOP_EDGE, new_top);

	if (new_top != this.get_top_edge()){
		this.dirty_flags.top_edge = true;
	}
	this.style.top = new_top + 'em';
}

/**
 * Get the width of the stiki
 */
Stiki.prototype.get_width = function Stiki_get_width()
{
	return Math.round_to(Elem.getWidth(this).value, 2);
}

/**
 * Set the width of the stiki
 */
Stiki.prototype.set_width = function Stiki_set_width(new_width)
{
	new_width = Math.round_to(new_width, 2);
	new_width = Math.max(Stiki.MIN_WIDTH, new_width);
	
	if (new_width != this.get_width()){
		this.dirty_flags.width = true;
		this.style.width = new_width + 'em';
		Elem.classRemove(this, 'expanded');		
		this.check_overflow();			
		this._halo.style.width = (new_width + Stiki.HALO_BORDER) + 'em';
		this._resize_button.style.left = '';
		this.restore_to = null;
	}
}

/**
 * Get the height of the stiki
 */
Stiki.prototype.get_height = function Stiki_get_height()
{
	return Math.round_to(Elem.getHeight(this).value, 2);
}

/**
 * Set the height of the stiki
 */
Stiki.prototype.set_height = function Stiki_set_height(new_height)
{
	new_height = Math.round_to(new_height, 2);
	new_height = Math.max(Stiki.MIN_HEIGHT, new_height);
	
	if (new_height != this.get_height()){
		this.dirty_flags.height = true;
		this.style.height = new_height + 'em';
		Elem.classRemove(this, 'expanded');
		this.check_overflow();
		this._halo.style.height = (new_height + Stiki.HALO_BORDER) + 'em';
		this._resize_button.style.top = '';
		this.restore_to = null;
	}
}

/**
 * Get the z_index of the stiki. 
 */
Stiki.prototype.get_z_index = function Stiki_get_z_index(newZIndex)
{
	// TODO: - This isn't calculated from the actual z_index of the stiki! Ideally, I 
	// would calculate the z_index by determining which order this stiki is in 
	// the parent's childNodes collection. But this is too difficult for now.
	return this._z_index;
}

/**
 * Set the z_index of the stiki. 
 */
Stiki.prototype.set_z_index = function Stiki_set_z_index(newZIndex)
{
	// TODO - At the moment, this doesn't actually influence the display of the stiki!
	// 		  ...but it should. Ideally, I should be reordering the stiki in the parent's
	// 		  childNodes collection, but this is too difficult to implement now. 
	//if (newZIndex != this._z_index){
	this._z_index = newZIndex;  
	this.dirty_flags.z_index = true;
	//}
}

/**
 * Get the background color of the stiki.
 */
Stiki.prototype.get_color = function Stiki_get_color()
{
	return Elem.getBackgroundColor(this._contents_div);
}

/**
 * Set the background color of the stiki.
 */
Stiki.prototype.set_color = function Stiki_set_color(newBackgroundColor)
{
	this.dirty_flags.color = true;
	this._contents_div.style.backgroundColor = newBackgroundColor;
}

/**
 * Move the stiki to the specified coordinates.
 */
Stiki.prototype.move_to = function Stiki_move_to(final_left, final_top)
{
	final_left = Math.max(final_left, Stiki.MIN_LEFT_EDGE - this.get_width());
	final_left = Math.min(final_left, Stiki.MAX_LEFT_EDGE);
	final_top = Math.max(final_top, Stiki.MIN_TOP_EDGE - this.get_height());
	final_top = Math.min(final_top, Stiki.MAX_TOP_EDGE);
	
	var stiki = this;
	new Effect.MoveEm(stiki, {
			x: final_left, 
			y: final_top, 
			duration: 0.8,
			afterFinish: function(){
				// Figure out what the new left position is...and save it.
				stiki.dirty_flags.left_edge = true;
				stiki.dirty_flags.top_edge = true;
				stiki.model.update(stiki, 'move_to');
			}
		}
	);
}

/**
 * Determine whether the stiki is selected.
 */
Stiki.prototype.get_is_selected = function Stiki_get_is_selected()
{
	return Elem.classCheck(this, 'selected');
}

/**
 * Make the stiki selected.
 */
Stiki.prototype.set_is_selected = function Stiki_set_is_selected(is_selected)
{
	if (is_selected){
		Elem.classAdd(this, 'selected');
	}
	else {
		Elem.classRemove(this, 'selected');
		Elem.classRemove(this, 'current');
	}
}

/**
 *
 */
Stiki.prototype.get_is_current = function Stiki_get_is_current()
{
	return Elem.classCheck(this, 'current');
}

/**
 *
 */
Stiki.prototype.set_is_current = function Stiki_set_is_current(is_current)
{
	if (is_current){
		Elem.classAdd(this, 'current');    
	}
	else {
		Elem.classRemove(this, 'current');    
	}
}

/**
 * Returns the amount by which the text in the stiki overflows the stiki
 * as a percentage of the current height. If there is no overflow, returns
 * zero.
 * @return {float} Number from 0 to 1 representing the percentage.
 */
Stiki.prototype.get_overflow_percentage = function Stiki_get_overflow_percentage()
{
	var amount_over = this._contents_div.scrollHeight - this._contents_div.offsetHeight;;
	return amount_over / this.offsetHeight;
}

/**
 * Called to make the element display a save progress indicator.
 */
Stiki.prototype.set_display_dirty = function Stiki_set_display_dirty(is_dirty)
{
	if(is_dirty){
		Elem.classAdd(this._dirty_marker, 'dirty');		
	}
	else {
		Elem.classRemove(this._dirty_marker, 'dirty');		
	}
}


// Utility functions. ////////////////////////////

/**
 * Bring the stiki to the front of the z-order.
 */
Stiki.prototype.bring_to_front = function Stiki_bring_to_front(){
	var parent = this.parentNode;
	this.set_z_index('front');
	parent.removeChild(this);
	parent.appendChild(this);
}

/**
 * Send the stiki to the back of the z-order.
 */
Stiki.prototype.send_to_back = function Stiki_send_to_back(){
	var parent = this.parentNode;
	this.set_z_index('back');
	parent.removeChild(this);
	parent.insertBefore(this, parent.firstChild);
}

/**
 * Checks whether the stiki's content has overflowed, and if so
 * updates the look of the stiki to show that there is some overflowed
 * content.
 */
Stiki.prototype.check_overflow = function Stiki_check_overflow()
{
	if (this.get_overflow_percentage() > 0){
		Elem.classAdd(this, 'has_overflow');
		Elem.classRemove(this, 'expanded');
	}
	else {
		Elem.classRemove(this, 'has_overflow');
	}
}

/**
 * Adjust the size of the stiki so it can fit any overflowed
 * text.
 */
Stiki.prototype.fit_to_contents = function Stiki_fit_to_contents()
{
	var overflow_percentage = this.get_overflow_percentage();
	if (overflow_percentage > 0){
		var restore_to = this.get_height();
		this.set_height(0.5 + ((1 + overflow_percentage) * restore_to));
		this.restore_to = restore_to;
		Elem.classAdd(this, 'expanded');
		Elem.classRemove(this, 'has_overflow');
		this.model.update(this, 'fit_to_contents');		
	}
}

/**
 * Restore the stiki back to the height it had before being fitted
 * to content.
 */
Stiki.prototype.restore_size = function Stiki_restore_height()
{
	if (this.restore_to){
		this.set_height(this.restore_to);
		this.check_overflow();
		this.model.update(this, 'restore_size');
	}
}

/**
 * Open the contents of the stiki for editing in the edit pane. 
 */
Stiki.prototype.edit = function Stiki_edit(e)
{	
	var e = e || window.event;
	app.edit.open(this.contents, e);
}

/**
 * Send the page with the specified title.
 */
Stiki.prototype.repage = function Stiki_repage(page_id)
{
	new Ajax.Request(app.page.get_id() +'/stikis/' + this.get_id() + '.js', {
			method: 'put',
			asynchronous: true,
			evalScripts: true,
			parameters: 'stiki[page_id]=' + escape(page_id) 
				+ '&authenticity_token=' + app.FORM_AUTH_TOKEN
		}
	);
}

/**
 * Calculate what a title text for the stiki should be.
 */
Stiki.prototype.calculateTitleText = function Stiki_calculateTitleText()
{
	/* Refer to repository for original funciton. */
}

// Return an xml representation of the stiki, suitable for serialization.
Stiki.prototype.toXml = function Stiki_toXml()
{
	Function.checkArgs(arguments, ['undefined']);
	
	// TODO - Could I use that jazzy e4x stuff here?
	// TODO - Rather than saving the positions as integers, perhaps I should save as a string, or a double.
	var xmlRet = ['<stiki'];
	xmlRet.push('stikiId="' + this.get_id() + '"');
	xmlRet.push('idOnPage="' + this.id + '"');
	xmlRet.push('pageTitle="' + this.getPageTitle() + '"');
	xmlRet.push('left="' + this.get_left_edge() + '"');
	xmlRet.push('top="' + this.get_top_edge() + '"');
	xmlRet.push('width="' + this.get_width() + '"');
	xmlRet.push('height="' + this.get_height() + '"');
	xmlRet.push('z_index="' + this.get_z_index() + '"');
	xmlRet.push('color="' + this.get_color() + '">');
	xmlRet.push('<![CDATA[' + escape(this.get_inner_HTML()) + ']]>');	// Todo - we shouldn't be relying on the client to escape this!
	xmlRet.push('<\/stiki>');		
	
	var xmlString = xmlRet.join('\n');
	return xmlString;
}

Stiki.prototype.getSettings = function Stiki_getSettings()
{
	Function.checkArgs(arguments, ['undefined']);
	
	var retObj = {
		left_edge: this.get_left_edge(),
		top_edge: this.get_top_edge(), 
		width: this.get_width(),
		height: this.get_height(),
		z_index: this.get_z_index(),
		color: this.get_color(),
		page_id: app.page.get_id(),
		inner_HTML: this.get_inner_HTML()
	};
	
	return retObj;
}


/**
 * Constructor for ActiveJs class, which handles 
 * keeping javascript objects in sync with server
 * objects in a rails application.
 * SEE: http://stikis.com/pages/99
 * dependencies 
 *  - prototype.js, for Ajax calls.
 *  - Extensions.js, for object wrapping.
 *
 * Example Usage:
 * app.Stiki = new ActiveJs(stiki, ['left_edge', 'top_edge', etc...]);
 * var a_stiki = app.Stiki.create({left_edge: 2});
 * a_stiki.set_left_edge(5);
 * app.Stiki.update(a_stiki);
 */
function ActiveJs(model_name, json_description){
	this.model_name = model_name;
	this.uri = json_description.uri;
	this.attributes = json_description.attributes;
	this.associations = json_description.associations;
	this.validations = json_description.validations;
}

/**
 * Create a new object on the page and the server.
 */
ActiveJs.prototype.create = function ActiveJs_create(elem)
{
	// Ensure that any 'validates_presence_of' attributes are present.
	for (var k in this.validations){
		elem.dirty_flags[k] = true;
	}
	
	var pars = this.build_dirty_query(elem);
	
	// Figure out if we need to create any associated elements.
	//var class_name = elem.id.split('_')[0];
	//for (var k in elem.create_associated){
	//	pars += class_name + '[' + k + ']' = 
	//}
	
	elem.save_pending = false;
	elem.is_saving = true;
	
	this.set_display_dirty(elem, true);
	Elem.classAdd(elem, 'new');
	
	var _this = this;
	var _onSuccess = function(response){
		_this.create_complete(elem, response);	
	}
	var _onFailure = function(response){
		_this.create_failure(elem, response);
	}
	// Fire off the create request.
	new Ajax.Request(this.uri(elem, false) + ".js",
		{
			method: 'post',
			asyncrhonous: true,
			evalScripts: false,
			parameters: pars,
			onSuccess: _onSuccess, 
			onFailure: _onFailure
		}
	);

	return false;
}

/**
 * Callback for when create requests complete.
 */
ActiveJs.prototype.create_complete = function ActiveJs_create_complete(elem, response, json_response)
{
	//window.alert('ActiveJs_create_complete');
	//var json_response = eval(response.responseText);
	if (! json_response){	   
		var json_response = response.responseText;
		try {
			eval('json_response = ' + json_response);
		} catch(e){
			window.alert('there was an error evaluating the response');
		}   
	}
    
	for (k in json_response.attributes){
		var setter_name = 'set_' + k;
		//var setter = elem['set_' + k];
		if (typeof(elem[setter_name]) == "function") {
			elem[setter_name](json_response.attributes[k]);
			delete elem.dirty_flags[k];
		}	
	}

	// Check if the element has any pending saves
	elem.is_saving = false;
	if (elem.is_save_pending){
		elem.model.update(elem, 'pending saves after create')
	}
	
	// Give the element a chance to do it's own thing...
	if (typeof(elem.create_complete) == 'function') elem.create_complete(response, json_response);
	
	Elem.classRemove(elem, 'new');
	this.set_display_dirty(elem, false);
	
	return false;
}

/**
 * When we get a create failure, it means that we need to remove the element 
 * from the dom. We can also display an error to the user so they can 
 * try again or try something else.
 */
ActiveJs.prototype.create_failure = function(elem, response)
{
	var json_error = '';
	try {
		eval ('json_error = ' + response.responseText);
	}
	catch (e){
		window.alert("There was an error evaluating the response (which was also an error).")
		return;
	}
	
	// Presumably, we got some information about the error from the response text,
	// so let's show this to the user.
	window.alert('There was an error in creating the object. ' 
		+ 'The message from the server was: ' 
		+ json_error.error.join(', ')
	);
	   
	// Remove the element from the dom.
	elem.parentNode.removeChild(elem); 
}

/**
 * Save changed properties of an object to the server.
 * @param (elem) the elem to save.
 * @param {String} reason
 */
ActiveJs.prototype.update = function ActiveJs_update(elem, reason)
{
	var pars = {};
	var class_name = elem.id.split('_')[0];
	if(this.needs_updating(elem)){
		// Prepare an ajax save, based on what we've recorded
		// as dirty properties for this element.	
		if (typeof(elem.reasons) == 'undefined' || elem.reasons == '' ){
			elem.reasons = reason;
		}
		else {
			elem.reasons += ', ' + reason;    
		}
		
		if (elem.is_saving){
			elem.is_save_pending = true;
		}
		else {
			pars[class_name] = this.get_attributes_hash(elem);
			pars.reasons = elem.reasons;
			pars = this.add_common_params(pars);
			pars = this.js_to_queryString(pars);
		
			this.set_display_dirty(elem, true);
			elem.reasons = '';
			elem.is_saving = true;
			var _this = this;
			var _onSuccess = function (response){
				_this.update_complete(elem, response);	
			}
			new Ajax.Request(this.uri(elem, true) + ".js", {
				method: 'put',
				asynchronous: true, 
				evalResponse: false,
				parameters: pars,
				onSuccess: _onSuccess, 
				onFailure: function(response){
						// console.log('update failure', response);
					},
					onException: function(_this, ex){
						// debugger;
					}
				}
			);		
	
			// Give the element a chance to do its own thing
			if (typeof(elem.update_start) == 'function') {
				elem.update_start();
			}
		}	
	}
	return false;		
}

/**
 * Handle when an update request completes.
 */
ActiveJs.prototype.update_complete = function ActiveJs_update_complete(elem, response)
{
	var json_response = response.responseText;
	try {
		eval('json_response = ' + json_response);
	} catch(e){
		//console.log('there was an error evaluating the response');
	}   
    
	elem.is_saving = false;
	if (elem.is_destroy_pending){
	  // TODO - Check that this works.
	  this.destroy(elem);
	}
	else if (elem.is_save_pending){
	  elem.is_save_pending = false;
		this.set_display_dirty(elem, false);
	  if (typeof(elem.update_complete) == 'function') elem.update_complete(response);
	  elem.model.update(elem, 'saveComplete');
	}
	else {
		// If the server has sent back any properties to adjust, 
		// then we should (as long as the element has a setter.
		for (k in json_response.attributes){
			var setter_name = 'set_' + k;
			if (typeof(elem[setter_name]) == 'function'){
				elem['set_' + k](unescape((json_response.attributes[k] || '')));
				delete elem.dirty_flags[k];				
			}
		}
		this.set_display_dirty(elem, false);
		// Give the elem a chance to do any custom stuff.
		if (typeof(elem.update_complete) == 'function') {
			elem.update_complete(response);
		}
	}
}

/**
 * Update a group of objects.
 * 
 * The request should be in the following format.
 * 
 * stikis = [{id = stiki.id, z_index = "back"},{}..]
 *     
 *     stikis_group.each do |stiki|
      updates.push({:id => stiki.id, :z_index => "back"})
    end
    
    put :update_group, :page_id => page.id, :stikis => updates
 * 
 */
ActiveJs.prototype.update_group = function ActiveJs_update_group(elems, reason){
	if (elems.length == 0){
		return false;
	}
	var elems_updating = [];
	var elem;
	var pars = {updates: []};
	var pars_string;
	var elem_pars;
	var hash;
	var _this = this;
	var uri;
	
	for (var i = 0; i < elems.length; i++) {
  	elem = elems[i];
  	if (this.needs_updating(elem)) {
  		// Prepare an ajax save, based on what we've recorded
			// as dirty properties for this element.	
			if (typeof(elem.reasons) == 'undefined' || elem.reasons == '') {
				elem.reasons = reason;
			}
			else {
				elem.reasons += ', ' + reason;
			}
			
			if (elem.is_saving) {
				elem.is_save_pending = true;
			}
			else {
				elems_updating.push(elem);
				elem_pars = this.get_attributes_hash(elem);
				pars.updates.push(elem_pars);

				this.set_display_dirty(elem, true);
				elem.reasons = '';
				elem.is_saving = true;				
			}
		}
	}
	
	if (elems_updating.length > 0) {
  	pars.reasons = reason;
  	pars = this.add_common_params(pars);
  	pars_string = this.js_to_queryString(pars);
  	
  	uri = this.uri() + "/update_group";
  	
  	new Ajax.Request(uri, {
	  		method: 'put',
	  		asynchronous: true,
	  		evalResponse: false,
	  		parameters: pars_string,
	  		onSuccess: function(response){
	  			_this.update_group_complete(elems_updating, response);
	  		},
	  		onFailure: function(response){
	  			// console.log('update failure', response);
				},
				onException: function(_this, ex){
					// debugger;
				}
			}
		);
		
		// Give all updating elements a chance to do their own thing
		for (var i = 0; i < elems_updating.length; i++) {
			var elem = elems_updating[i];
			if (typeof(elem.update_start) == 'function') {
				elem.update_start();
			}
		}
	}
	return false;
}


/**
 * Handle when an update request completes.
 */
ActiveJs.prototype.update_group_complete = function ActiveJs_update_complete(elems, response)
{
	var elem;
	var json_response = response.responseText;
	try {
		eval('json_response = ' + json_response);
	} catch(e){
		//console.log('there was an error evaluating the response');
	}   
	
	for(var i = 0; i < elems.length; i++){
		elem = elems[i];
		elem.is_saving = false;
		if (elem.is_destroy_pending){
			// TODO - Check that this works.
			this.destroy(elem);
		}
		else if (elem.is_save_pending){
			elem.is_save_pending = false;
			this.set_display_dirty(elem, false);
			if (typeof(elem.update_complete) == 'function') {
				elem.update_complete(response);
			}
			elem.model.update(elem, 'saveComplete');
		}
		else {
			// If the server has sent back any properties to adjust, 
			// then we should (as long as the element has a setter.
			for (k in json_response.attributes){
				var setter_name = 'set_' + k;
				if (typeof(elem[setter_name]) == 'function'){
					elem['set_' + k](unescape((json_response.attributes[k] || '')));
					delete elem.dirty_flags[k];				
				}
			}
			this.set_display_dirty(elem, false);
			// Give the elem a chance to do any custom stuff.
			if (typeof(elem.update_complete) == 'function') {
		  	elem.update_complete(response);
		  }
		}			
	}
}

/**
 * Delete object on the server.
 */
ActiveJs.prototype.destroy = function ActiveJs_destroy(elem)
{
	// Give the elem a chance to do any custom stuff.
	if (typeof(elem.destroy_start) == 'function') {
		elem.destroy_start();
  }
	
	// We won't actually issue the destroy request until any 
	// pending requests finish. Check the update_complete method
	// for the logic that sends us back here when the request
	// completes.
	if (elem.is_saving){
	  elem.is_destroy_pending = true;
	}
	else {
		elem.is_destroying = true;
		// Go ahead and fire off the destroy request.
		var _this = this;
		var _onSuccess = function(response){
			_this.destroy_complete(elem, response);
		}	
		var pars = 'authenticity_token=' + app.FORM_AUTH_TOKEN;
	
		new Ajax.Request(this.uri(elem, true) + ".js", {
				method: 'delete',
				parameters: pars,
				asynchronous: true,
				evalScripts: false,
				onSuccess: _onSuccess,
				onFailure: function(){window.alert('destroy failure');}
			}
		);       			
	}
	return false;
}

/**
 * Called when the request to destroy an object completes.
 */
ActiveJs.prototype.destroy_complete = function ActiveJs_destroy_complete(elem, response)
{
	// TODO: Check the response.responseText property.
	
	// Give the element a chance to do its own thing.
	if (typeof(elem.destroy_complete) == "function") elem.destroy_complete(response);
	
	// Remove the element from the DOM.
	// TODO: This would be a good place to clean up memory leaks?
	Element.remove(elem);
}

// Utility functions ////////////////////////////

/** 
 * Determine whether an element actually needs updating.
 * @param {Object} elem
 */
ActiveJs.prototype.needs_updating = function ActiveJs_needs_updating(elem)
{
	for (var k in elem.dirty_flags){
		if (elem.dirty_flags[k]){
			return true;
		}
	}
	return false;
}

/** 
 * Build a query string of dirty attributes. Used for both saving and creating.
 */
ActiveJs.prototype.build_dirty_query = function ActiveJs_build_dirty_query(elem)
{
	return this.base_dirty_query(elem) + "&" + this.common_query_params();
}

/** 
 * Build a base dirty query
 */
ActiveJs.prototype.base_dirty_query = function ActiveJs_base_dirty_query(elem)
{
  var class_name = elem.id.split('_')[0];
	var dirty_hash = {};
	dirty_hash[class_name] = this.get_attributes_hash(elem);
	return this.js_to_queryString(dirty_hash);
}

/** 
 * Get a hash with the attributes that need updating for the element.
 * @param {Object} js
 * @param {Object} prefix
 */
ActiveJs.prototype.get_attributes_hash = function ActiveJs_get_attributes_hash(elem)
{
	var attributes = {id: elem.get_id()};
  for (var k in elem.dirty_flags){
		attributes[k] = encodeURIComponent(elem['get_' + k]());
    delete elem.dirty_flags[k];
  }
	return attributes;
}

/**
 * Recurse dispatcher for turning an arbitrary js object into a serialized form query.
 */
ActiveJs.prototype.js_to_queryString = function ActiveJs_js_to_queryString(js, prefix)
{
	var query;
	if(Object.isArray(js)){
		query = this.array_to_queryString(js, prefix);		
	}
	else if (typeof(js) == 'object'){
		query = this.hash_to_queryString(js, prefix);			
	}
	else {
		query = [prefix + '=' + js];
	}
	query = query.join('&');
  // console.log(query);
	return query;
}

/** 
 * Return a javascript object formatted as serialized form parameters. 
 * TODO - Look into using the prototype Object.toQueryString() method as an 
 * 				alternative to this. I've tried it now, but it doesn't seem to 
 * 				include nested attributes.
 * @param {Object} elem
 */
ActiveJs.prototype.hash_to_queryString = function ActiveJs_hash_to_queryString(hash, prefix)
{
	return_string = [];
	for(key in hash){
		value = hash[key];
		var next_prefix = (typeof(prefix) != 'undefined') ? prefix + '[' + key + ']': key;
		return_string = return_string.concat(this.js_to_queryString(value, next_prefix));
	}
	return return_string;
}

/**
 * 
 */
ActiveJs.prototype.array_to_queryString = function ActiveJs_array_to_queryString(array, prefix)
{
	var value;
	var next_prefix;
	var return_string = [];

	for(var key = 0; key < array.length; key++){
		value = array[key];
		next_prefix = (typeof(prefix) != 'undefined') ? prefix + '[' + key + ']': key;
		return_string = return_string.concat(this.js_to_queryString(value, next_prefix));
	}
	return return_string;
}

/** 
 * Build the parts of the query for time & authenticity token.
 */
ActiveJs.prototype.common_query_params = function ActiveJs_common_query_params(elem)
{
  return 'time=' + new Date().getTime() + '&authenticity_token=' + app.FORM_AUTH_TOKEN + '&';
}

/**
 * Add Common Query Parameters to an update hash.
 */
ActiveJs.prototype.add_common_params = function ActiveJs_add_common_params(hash)
{
	hash.time = new Date().getTime();
	hash.authenticity_token = app.FORM_AUTH_TOKEN;
	return hash;
}

/**
 * Set class = 'dirty' (or not) on the element. If the element has a special 
 * function for this, then call that.
 */
ActiveJs.prototype.set_display_dirty = function ActiveJs_set_display_dirty(elem, is_dirty)
{
	if (typeof(elem.set_display_dirty) == 'function') {
  	return elem.set_display_dirty(is_dirty);
  }
	
	if (is_dirty){
  	return Elem.classAdd(elem, 'dirty');
	}

  return Elem.classRemove(elem, 'dirty');
}

ActiveJs_stub = function(){
	return this;
}
ActiveJs_stub.prototype = {
	create: function(){},
	update: function(){},
	update_group: function(){},
	destroy: function(){}
}

/**
 * Object 'namespace' for application.
 */
var app = {};

app.version = "0.6.8";

/**
 * Will contain a hash of model descriptions in json.
 */ 
app.models = {};

/**
 * Will contain class definitions for javascript controllers.
 */
app.controllers = {}

/**
 * Will contain templates for dhtml views.
 */
app.views = {}

/**
 * Function to create a new dom element, controller and model along
 * with a corresponding object on the server.
 */
app.create = function app_create(class_name, custom_attrs, parent_node, create_associated)
{
    var custom_attrs = custom_attrs || {};
    var parent_node = parent_node || app.views[class_name].parent_node;

	// Create new dom template.	
	var new_elem = Elem.clone_template(app.views[class_name].template);

	if (app.views[class_name].insert_at_front){
	   parent_node.insertBefore(new_elem, parent_node.childNodes[0]);
	}
	else {
    	parent_node.appendChild(new_elem);	
	}
	
	var model = app.models[class_name];
	new app.controllers[class_name](new_elem, model);
	
	// Set custom attributes on the element here 
	for (k in custom_attrs){
		new_elem['set_' + k](custom_attrs[k]);
	}
	
	// Give the new element a chance to present itself...
	if (typeof(new_elem.create_start) == 'function') new_elem.create_start();
	
	// Finally, create a corresponding object on the server.
	model.create(new_elem);
	
	return new_elem;
}

/**
 * Function to attach dom elements to their controllers and models
 * when they are first interacted with by the user.
 * Either the elem, or the server_instance can be null. 
 * TODO: For now, I assume that the attach is triggered by a mousedown.
 */
app.attach = function app_attach(elem, e)
{
	if (e && e.type){
		var pass_on_event = 'on' + e.type;
		elem[pass_on_event] = '';    
	}
	var class_name = elem.id.split('_')[0];
	var model = app.models[class_name];
	new app.controllers[class_name](elem, model);

    // If attach was triggered from an event, then 
    // give the new object a chance to process the event. 
    if (pass_on_event){
        if (typeof(elem[pass_on_event]) == "function"){
            elem[pass_on_event](e);
        }
    }
	return elem;
}

/**
 * Function to create a client object to go with one that's been created on 
 * the server.
 * @param {Object} elem
 */
app.create_elem = function app_create_elem(class_name, custom_attrs, parent_node)
{
    var custom_attrs = custom_attrs || {};
    var parent_node = parent_node || app.views[class_name].parent_node;

	// Create new dom template.	
	var new_elem = Elem.clone_template(app.views[class_name].template);
	parent_node.appendChild(new_elem);
	
	var model = app.models[class_name];
	new app.controllers[class_name](new_elem, model);
	
	// Set custom attributes on the element here 
	for (k in custom_attrs){
		new_elem['set_' + k](custom_attrs[k]);
		delete new_elem.dirty_flags[k];
	}
	
	// Give the new element a chance to present itself...
	if (typeof(new_elem.create_start) == 'function') new_elem.create_start();
	
	// Finally, create a corresponding object on the server.
	//model.create(new_elem);
	
	return new_elem;
}

/**
 * Function to destroy dom elements and their controllers along with the 
 * associated server object.
 */
app.destroy = function app_destroy(elem)
{
}


// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults


/**
 * contents.js 
 * Jared Donovan. November 2006.
 * 
 * This file contains javascript code to control the behavior
 * of the contents of stikis. It provides classes that can be
 * wrapped over each of the different kinds of content, methods
 * for synching content with the server, and for allowing editing
 * of the content.
 */

/**
 * Class for HtmlContent.
 * @constructor
 * @param {Object} dom_or_attrs - Either a dom element to wrap to, 
 * 		or a hash of attributes to override the defaults. 
 */
function HtmlContent(elem, model)
{
	var arg_pattern = Function.checkArgs(arguments, 
		['undefined'], ['object', 'object']
	);
	
	if (arg_pattern == 1){
		// Wrap to an existing element.
		this.model = model;
		Object.myExtend(elem, this);
		elem.dirty_flags = {};
		
		// Initialisation of the content.
		
		// <div stiki><div contents_div><div content /></div></div>
		elem.stiki = elem.parentNode.parentNode;
		
		// Any event handlers would get attached here
		// Also any references to child nodes.
		// Also any setting of visual attributes.
		
		return elem;
	}
	return null;	
}

// Event handlers ////////////////////////////////

/**
 * Called to make the element display a save progress indicator.
 */
HtmlContent.prototype.set_display_dirty = function HtmlContent_set_display_dirty(is_dirty)
{
	if(is_dirty){
		Elem.classAdd(this.stiki._dirty_marker, 'content_dirty');		
	}
	else {
		Elem.classRemove(this.stiki._dirty_marker, 'content_dirty');		
	}
}

/**
 * Called as the content is created (but before it has been
 * properly created on the server.)
 */
HtmlContent.prototype.create_start = function HtmlContent_create_start()
{
	return false;
}

/**
 * Called when an update request is first sent. We need to set the dirty
 * marker on our parent node so the save indicator will show.
 */
HtmlContent.prototype.update_start = function HtmlContent_update_start()
{
	Elem.classAdd(this.parentNode, 'dirty');
}

/**
 * Called when the update completes. We need to unset the dirty marker 
 * on our parent node.
 */
HtmlContent.prototype.update_complete = function HtmlContent_update_complete()
{
	Elem.classRemove(this.parentNode, 'dirty');
}

/**
 * Called as the content is destroyed, (but before it has
 * been properly destroyed on the server.)
 */
HtmlContent.prototype.destroy_start = function HtmlContent_destroy_start()
{
	return false;
}

// Accessors /////////////////////////////////////

/**
 * Return the database id for the content.
 * @type Number
 */
HtmlContent.prototype.get_id = function HtmlContent_get_id()
{
  var dbId = this.id.split('_').last();
  if (!isNaN(dbId)) {
  	dbId = Number(dbId);
  }
  return dbId;
}

/**
 * Set the database id for the content.
 * @argument {Number} new_id The new id to use.
 * @return null
 */
HtmlContent.prototype.set_id = function HtmlContent_set_id(new_id)
{
	// Do I need to set the dirty flag?
	//if (new_id != this.get_id()){
	//	this.dirty_flags.id = true;
	//}
	this.id = 'content_' + new_id;
}

/**
 * Get the database id of the stiki that this content belongs to.
 * @type {Number}
 * @return the id of the owner stiki.
 */
HtmlContent.prototype.get_stiki_id = function HtmlContent_get_stiki_id()
{
	if (this.stiki_id){
		return this.stiki_id;
	}
	else {
		return this.stiki.get_id();
	}
}

/** 
 * Set the stiki_id for the content. Setting the stiki_id to something
 * other than what the current stiki id is will have the effect of
 * moving this content to the new stiki.
 * @argument {Number} The database id of the owner stiki.
 * @return null
 */
HtmlContent.prototype.set_stiki_id = function HtmlContent_set_stiki_id(new_id)
{
	if (new_id != this.get_stiki_id()){
		this.dirty_flags.stiki_id = true;
		this.stiki_id = new_id;
	}
}

/**
 * Return the html for this html content.
 * @type {String}
 */
HtmlContent.prototype.get_html = function HtmlContent_get_html()
{
	return this.innerHTML;
}

/**
 * Set the html for this html content.
 * @argument {String} new_html the new html to put into the content.
 * @return null
 */
HtmlContent.prototype.set_html = function HtmlContent_set_html(new_html)
{
	new_html = (new_html || ' ');
	if (new_html != this.get_html()){
		this.dirty_flags.html = true;
		this.innerHTML = new_html;
		this.stiki.check_overflow();
	}
	return null;
}

/**
 * @author jared
 */

function fixPngs(){	
	var src;
	var filter;
	var w;
	var h;
	var png;
	var pngs = document.getElementsByClassName('png');
	for (var i = 0; i < pngs.length; i++){
		try {
			png = pngs[i];
			src = png.src;
			filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="' + src 
				+ '", enabled="true", sizingMethod="scale")';
			png.src = "/images/blank.gif";
			png.style.filter = filter;
		} catch(e){
			for(var k in e){
				window.alert(k + ": " + e[k]);
			}
		}
	}
}

function fixHover(){
	var elems = document.getElementsByClassName('menu_item');
	
	var new_stiki_button = document.getElementById('new_stiki_button');	
	if (new_stiki_button){
		elems.push(new_stiki_button);
	}
	
	var color_patches = document.getElementsByClassName('color_patch');
	elems = elems.concat(color_patches);

	for (var i = 0; i < elems.length; i++){
		var elem = elems[i];
		elem.onmouseover = function(){
			if (!Elem.classCheck(this, 'current')) {
				Elem.classAdd(this, "hovering");	  	
			}
		}
		elem.onmouseout = function(){
			Elem.classRemove(this, "hovering");
		}
	}
}


// Pages
app.models.page = {"validations": {"user_id": "validates_presence_of", "title": "validates_presence_of"}, "associations": {"user": "belongs_to", "stiki": "has_many"}, "attributes": {"updated_at": "Date", "title": "String", "left_edge": "Number", "id": "Number", "top_edge": "Number", "accessed_at": "Date", "zoom": "Number", "user_id": "Number", "created_at": "Date"}};
app.models.page.uri = function(elem, by_id){
    var uri = "/pages";
    if (by_id) uri += "/" + elem.get_id();
    return uri;
};
// Stikis
app.models.stiki = {"validations": {"page_id": "validates_presence_of"}, "associations": {"page": "belongs_to", "content": "has_many"}, "attributes": {"updated_at": "Date", "z_index": "Number", "left_edge": "Number", "page_id": "Number", "id": "Number", "color": "String", "height": "Number", "top_edge": "Number", "created_at": "Date", "width": "Number"}};
app.models.stiki.uri = function(elem, by_id){
    var uri =  "/pages/" + app.page.get_id() + "/stikis";
    if (by_id) uri += "/" + elem.get_id();
    return uri;
};
// Contents
app.models.content = {"validations": {"stiki_id": "validates_presence_of"}, "associations": {"stiki": "belongs_to"}, "attributes": {"html": "String", "url": "String", "type": "String", "id": "Number", "stiki_id": "Number"}};
app.models.content.uri = function(elem, by_id){
    var uri = "/pages/" + app.page.get_id() + "/stikis/" + elem.get_stiki_id() + "/contents";
    return uri;
};


// First attempt at doing something to make images pre-load.
if (document.images) {
	var preloaded_images = {
		1: 'resize-button-14x14.png',
		2: 'pencil-14x14.png',
		3: 'fit_to_content.gif',
		4: 'restore_to.gif',
		5: 'save_in_progress.gif'
	};
	
	for (var k in preloaded_images) {
		name = preloaded_images[k];
		preloaded_images[k] = new Image();
		preloaded_images[k].src = "/images/" + name;
	}
}