/*  Prototype JavaScript framework, version 1.5.1.1
 *  (c) 2005-2007 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: '1.5.1.1',
  
Browser: {
IE:     !!(window.attachEvent && !window.opera),
Opera:  !!window.opera,
WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1
},
  
BrowserFeatures: {
XPath: !!document.evaluate,
ElementExtensions: !!window.HTMLElement,
SpecificElementExtensions:
  (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 }
}

var Class = {
create: function() {
  return function() {
	this.initialize.apply(this, arguments);
  }
}
}

var Abstract = new Object();

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 === undefined) return 'undefined';
			  if (object === null) return 'null';
			  return object.inspect ? object.inspect() : object.toString();
			  } 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.ownerDocument === document) return;
			  var results = [];
			  for (var property in object) {
			  var value = Object.toJSON(object[property]);
			  if (value !== undefined)
			  results.push(property.toJSON() + ': ' + value);
			  }
			  return '{' + results.join(', ') + '}';
			  },
			  
			  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);
			  }
			  });

Function.prototype.bind = function() {
  var __method = this, args = $A(arguments), object = args.shift();
  return function() {
    return __method.apply(object, args.concat($A(arguments)));
  }
}

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

Object.extend(Number.prototype, {
			  toColorPart: function() {
			  return this.toPaddedString(2, 16);
			  },
			  
			  succ: function() {
			  return this + 1;
			  },
			  
			  times: function(iterator) {
			  $R(0, this, true).each(iterator);
			  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';
			  }
			  });

Date.prototype.toJSON = function() {
  return '"' + this.getFullYear() + '-' +
  (this.getMonth() + 1).toPaddedString(2) + '-' +
  this.getDate().toPaddedString(2) + 'T' +
  this.getHours().toPaddedString(2) + ':' +
  this.getMinutes().toPaddedString(2) + ':' +
  this.getSeconds().toPaddedString(2) + '"';
};

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;
}
}

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

var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
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);
},
  
stop: function() {
  if (!this.timer) return;
  clearInterval(this.timer);
  this.timer = null;
},
  
onTimerEvent: function() {
  if (!this.currentlyExecuting) {
	try {
	  this.currentlyExecuting = true;
	  this.callback(this);
	} 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 = count === undefined ? 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 this;
			  },
			  
			  truncate: function(length, truncation) {
			  length = length || 30;
			  truncation = truncation === undefined ? '...' : truncation;
			  return this.length > length ?
			  this.slice(0, length - truncation.length) + truncation : 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 = document.createElement('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 (hash[key].constructor != Array) 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) {
			  var result = '';
			  for (var i = 0; i < count; i++) result += this;
			  return result;
			  },
			  
			  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.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);
														  }
														  });
														  
														  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.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
														  }
														  });
														  
														  String.prototype.gsub.prepareReplacement = function(replacement) {
														  if (typeof replacement == 'function') 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('')
														  });
														  
														  with (String.prototype.escapeHTML) div.appendChild(text);
														  
														  var Template = Class.create();
														  Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
														  Template.prototype = {
														  initialize: function(template, pattern) {
														  this.template = template.toString();
														  this.pattern  = pattern || Template.Pattern;
														  },
														  
														  evaluate: function(object) {
														  return this.template.gsub(this.pattern, function(match) {
														  var before = match[1];
														  if (before == '\\') return match[2];
														  return before + String.interpret(object[match[3]]);
														  });
														  }
														  }
														  
														  var $break = {}, $continue = new Error('"throw $continue" is deprecated, use "return" instead');
														  
														  var Enumerable = {
														  each: function(iterator) {
														  var index = 0;
														  try {
														  this._each(function(value) {
														  iterator(value, index++);
														  });
														  } catch (e) {
														  if (e != $break) throw e;
														  }
														  return this;
														  },
														  
														  eachSlice: function(number, iterator) {
														  var index = -number, slices = [], array = this.toArray();
														  while ((index += number) < array.length)
														  slices.push(array.slice(index, index+number));
														  return slices.map(iterator);
														  },
														  
														  all: function(iterator) {
														  var result = true;
														  this.each(function(value, index) {
														  result = result && !!(iterator || Prototype.K)(value, index);
														  if (!result) throw $break;
														  });
														  return result;
														  },
														  
														  any: function(iterator) {
														  var result = false;
														  this.each(function(value, index) {
														  if (result = !!(iterator || Prototype.K)(value, index))
														  throw $break;
														  });
														  return result;
														  },
														  
														  collect: function(iterator) {
														  var results = [];
														  this.each(function(value, index) {
														  results.push((iterator || Prototype.K)(value, index));
														  });
														  return results;
														  },
														  
														  detect: function(iterator) {
														  var result;
														  this.each(function(value, index) {
														  if (iterator(value, index)) {
														  result = value;
														  throw $break;
														  }
														  });
														  return result;
														  },
														  
														  findAll: function(iterator) {
														  var results = [];
														  this.each(function(value, index) {
														  if (iterator(value, index))
														  results.push(value);
														  });
														  return results;
														  },
														  
														  grep: function(pattern, iterator) {
														  var results = [];
														  this.each(function(value, index) {
														  var stringValue = value.toString();
														  if (stringValue.match(pattern))
														  results.push((iterator || Prototype.K)(value, index));
														  })
														  return results;
														  },
														  
														  include: function(object) {
														  var found = false;
														  this.each(function(value) {
														  if (value == object) {
														  found = true;
														  throw $break;
														  }
														  });
														  return found;
														  },
														  
														  inGroupsOf: function(number, fillWith) {
														  fillWith = fillWith === undefined ? null : fillWith;
														  return this.eachSlice(number, function(slice) {
														  while(slice.length < number) slice.push(fillWith);
														  return slice;
														  });
														  },
														  
														  inject: function(memo, iterator) {
														  this.each(function(value, index) {
														  memo = iterator(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) {
														  var result;
														  this.each(function(value, index) {
														  value = (iterator || Prototype.K)(value, index);
														  if (result == undefined || value >= result)
														  result = value;
														  });
														  return result;
														  },
														  
														  min: function(iterator) {
														  var result;
														  this.each(function(value, index) {
														  value = (iterator || Prototype.K)(value, index);
														  if (result == undefined || value < result)
														  result = value;
														  });
														  return result;
														  },
														  
														  partition: function(iterator) {
														  var trues = [], falses = [];
														  this.each(function(value, index) {
														  ((iterator || Prototype.K)(value, index) ?
														  trues : falses).push(value);
														  });
														  return [trues, falses];
														  },
														  
														  pluck: function(property) {
														  var results = [];
														  this.each(function(value, index) {
														  results.push(value[property]);
														  });
														  return results;
														  },
														  
														  reject: function(iterator) {
														  var results = [];
														  this.each(function(value, index) {
														  if (!iterator(value, index))
														  results.push(value);
														  });
														  return results;
														  },
														  
														  sortBy: function(iterator) {
														  return this.map(function(value, index) {
														  return {value: value, criteria: iterator(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 (typeof args.last() == 'function')
														  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,
														  member:  Enumerable.include,
														  entries: Enumerable.toArray
														  });
														  var $A = Array.from = function(iterable) {
														  if (!iterable) return [];
														  if (iterable.toArray) {
														  return iterable.toArray();
														  } else {
														  var results = [];
														  for (var i = 0, length = iterable.length; i < length; i++)
														  results.push(iterable[i]);
														  return results;
														  }
														  }
														  
														  if (Prototype.Browser.WebKit) {
														  $A = Array.from = function(iterable) {
														  if (!iterable) return [];
														  if (!(typeof iterable == 'function' && iterable == '[object NodeList]') &&
														  iterable.toArray) {
														  return iterable.toArray();
														  } else {
														  var results = [];
														  for (var i = 0, length = iterable.length; i < length; i++)
														  results.push(iterable[i]);
														  return results;
														  }
														  }
														  }
														  
														  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(value && value.constructor == Array ?
														  value.flatten() : [value]);
														  });
														  },
														  
														  without: function() {
														  var values = $A(arguments);
														  return this.select(function(value) {
														  return !values.include(value);
														  });
														  },
														  
														  indexOf: function(object) {
														  for (var i = 0, length = this.length; i < length; i++)
														  if (this[i] == object) return i;
														  return -1;
														  },
														  
														  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;
														  });
														  },
														  
														  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 (value !== undefined) results.push(value);
														  });
														  return '[' + results.join(', ') + ']';
														  }
														  });
														  
														  Array.prototype.toArray = Array.prototype.clone;
														  
														  function $w(string) {
														  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 (arguments[i].constructor == Array) {
														  for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
														  array.push(arguments[i][j]);
														  } else {
														  array.push(arguments[i]);
														  }
														  }
														  return array;
														  }
														  }
														  var Hash = function(object) {
														  if (object instanceof Hash) this.merge(object);
														  else Object.extend(this, object || {});
														  };
														  
														  Object.extend(Hash, {
														  toQueryString: function(obj) {
														  var parts = [];
														  parts.add = arguments.callee.addPair;
														  
														  this.prototype._each.call(obj, function(pair) {
														  if (!pair.key) return;
														  var value = pair.value;
														  
														  if (value && typeof value == 'object') {
														  if (value.constructor == Array) value.each(function(value) {
														  parts.add(pair.key, value);
														  });
														  return;
														  }
														  parts.add(pair.key, value);
														  });
														  
														  return parts.join('&');
														  },
														  
														  toJSON: function(object) {
														  var results = [];
														  this.prototype._each.call(object, function(pair) {
														  var value = Object.toJSON(pair.value);
														  if (value !== undefined) results.push(pair.key.toJSON() + ': ' + value);
														  });
														  return '{' + results.join(', ') + '}';
														  }
														  });
														  
														  Hash.toQueryString.addPair = function(key, value, prefix) {
														  key = encodeURIComponent(key);
														  if (value === undefined) this.push(key);
														  else this.push(key + '=' + (value == null ? '' : encodeURIComponent(value)));
														  }
														  
														  Object.extend(Hash.prototype, Enumerable);
														  Object.extend(Hash.prototype, {
														  _each: function(iterator) {
														  for (var key in this) {
														  var value = this[key];
														  if (value && value == Hash.prototype[key]) continue;
														  
														  var pair = [key, value];
														  pair.key = key;
														  pair.value = value;
														  iterator(pair);
														  }
														  },
														  
														  keys: function() {
														  return this.pluck('key');
														  },
														  
														  values: function() {
														  return this.pluck('value');
														  },
														  
														  merge: function(hash) {
														  return $H(hash).inject(this, function(mergedHash, pair) {
														  mergedHash[pair.key] = pair.value;
														  return mergedHash;
														  });
														  },
														  
														  remove: function() {
														  var result;
														  for(var i = 0, length = arguments.length; i < length; i++) {
														  var value = this[arguments[i]];
														  if (value !== undefined){
														  if (result === undefined) result = value;
														  else {
														  if (result.constructor != Array) result = [result];
														  result.push(value)
														  }
														  }
														  delete this[arguments[i]];
														  }
														  return result;
														  },
														  
														  toQueryString: function() {
														  return Hash.toQueryString(this);
														  },
														  
														  inspect: function() {
														  return '#<Hash:{' + this.map(function(pair) {
														  return pair.map(Object.inspect).join(': ');
														  }).join(', ') + '}>';
														  },
														  
														  toJSON: function() {
														  return Hash.toJSON(this);
														  }
														  });
														  
														  function $H(object) {
														  if (object instanceof Hash) return object;
														  return new Hash(object);
														  };
														  
														  // Safari iterates over shadowed properties
														  if (function() {
														  var i = 0, Test = function(value) { this.key = value };
														  Test.prototype.key = 'foo';
														  for (var property in new Test('bar')) i++;
														  return i > 1;
														  }()) Hash.prototype._each = function(iterator) {
														  var cache = [];
														  for (var key in this) {
														  var value = this[key];
														  if ((value && value == Hash.prototype[key]) || cache.include(key)) continue;
														  cache.push(key);
														  var pair = [key, value];
														  pair.key = key;
														  pair.value = value;
														  iterator(pair);
														  }
														  };
														  ObjectRange = Class.create();
														  Object.extend(ObjectRange.prototype, Enumerable);
														  Object.extend(ObjectRange.prototype, {
														  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 (typeof responder[callback] == 'function') {
														  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 = function() {};
														  Ajax.Base.prototype = {
														  setOptions: function(options) {
														  this.options = {
														  method:       'post',
														  asynchronous: true,
														  contentType:  'application/x-www-form-urlencoded',
														  encoding:     'UTF-8',
														  parameters:   ''
														  }
														  Object.extend(this.options, options || {});
														  
														  this.options.method = this.options.method.toLowerCase();
														  if (typeof this.options.parameters == 'string')
														  this.options.parameters = this.options.parameters.toQueryParams();
														  }
														  }
														  
														  Ajax.Request = Class.create();
														  Ajax.Request.Events =
														  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
														  
														  Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
														  _complete: false,
														  
														  initialize: function(url, options) {
														  this.transport = Ajax.getTransport();
														  this.setOptions(options);
														  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 = Hash.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 {
														  if (this.options.onCreate) this.options.onCreate(this.transport);
														  Ajax.Responders.dispatch('onCreate', this, this.transport);
														  
														  this.transport.open(this.method.toUpperCase(), this.url,
														  this.options.asynchronous);
														  
														  if (this.options.asynchronous)
														  setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);
														  
														  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 (typeof extras.push == 'function')
														  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() {
														  return !this.transport.status
														  || (this.transport.status >= 200 && this.transport.status < 300);
														  },
														  
														  respondToReadyState: function(readyState) {
														  var state = Ajax.Request.Events[readyState];
														  var transport = this.transport, json = this.evalJSON();
														  
														  if (state == 'Complete') {
														  try {
														  this._complete = true;
														  (this.options['on' + this.transport.status]
														  || this.options['on' + (this.success() ? 'Success' : 'Failure')]
														  || Prototype.emptyFunction)(transport, json);
														  } catch (e) {
														  this.dispatchException(e);
														  }
														  
														  var contentType = this.getHeader('Content-type');
														  if (contentType && contentType.strip().
														  match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
														  this.evalResponse();
														  }
														  
														  try {
														  (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
														  Ajax.Responders.dispatch('on' + state, this, transport, json);
														  } catch (e) {
														  this.dispatchException(e);
														  }
														  
														  if (state == 'Complete') {
														  // avoid memory leak in MSIE: clean up
														  this.transport.onreadystatechange = Prototype.emptyFunction;
														  }
														  },
														  
														  getHeader: function(name) {
														  try {
														  return this.transport.getResponseHeader(name);
														  } catch (e) { return null }
														  },
														  
														  evalJSON: function() {
														  try {
														  var json = this.getHeader('X-JSON');
														  return json ? json.evalJSON() : 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.Updater = Class.create();
														  
														  Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
														  initialize: function(container, url, options) {
														  this.container = {
														  success: (container.success || container),
														  failure: (container.failure || (container.success ? null : container))
														  }
														  
														  this.transport = Ajax.getTransport();
														  this.setOptions(options);
														  
														  var onComplete = this.options.onComplete || Prototype.emptyFunction;
														  this.options.onComplete = (function(transport, param) {
														  this.updateContent();
														  onComplete(transport, param);
														  }).bind(this);
														  
														  this.request(url);
														  },
														  
														  updateContent: function() {
														  var receiver = this.container[this.success() ? 'success' : 'failure'];
														  var response = this.transport.responseText;
														  
														  if (!this.options.evalScripts) response = response.stripScripts();
														  
														  if (receiver = $(receiver)) {
														  if (this.options.insertion)
														  new this.options.insertion(receiver, response);
														  else
														  receiver.update(response);
														  }
														  
														  if (this.success()) {
														  if (this.onComplete)
														  setTimeout(this.onComplete.bind(this), 10);
														  }
														  }
														  });
														  
														  Ajax.PeriodicalUpdater = Class.create();
														  Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
														  initialize: function(container, url, options) {
														  this.setOptions(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(request) {
														  if (this.options.decay) {
														  this.decay = (request.responseText == this.lastText ?
														  this.decay * this.options.decay : 1);
														  
														  this.lastText = request.responseText;
														  }
														  this.timer = setTimeout(this.onTimerEvent.bind(this),
														  this.decay * this.frequency * 1000);
														  },
														  
														  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 (typeof element == 'string')
														  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(query.snapshotItem(i));
														  return results;
														  };
														  
														  document.getElementsByClassName = function(className, parentElement) {
														  var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
														  return document._getElementsByXPath(q, parentElement);
														  }
														  
														  } else document.getElementsByClassName = function(className, parentElement) {
														  var children = ($(parentElement) || document.body).getElementsByTagName('*');
														  var elements = [], child, pattern = new RegExp("(^|\\s)" + className + "(\\s|$)");
														  for (var i = 0, length = children.length; i < length; i++) {
														  child = children[i];
														  var elementClassName = child.className;
														  if (elementClassName.length == 0) continue;
														  if (elementClassName == className || elementClassName.match(pattern))
														  elements.push(Element.extend(child));
														  }
														  return elements;
														  };
														  
/*--------------------------------------------------------------------------*/
														  
														  if (!window.Element) var Element = {};
														  
														  Element.extend = function(element) {
														  var F = Prototype.BrowserFeatures;
														  if (!element || !element.tagName || element.nodeType == 3 ||
															  element._extended || F.SpecificElementExtensions || element == window)
														  return element;
														  
														  var methods = {}, tagName = element.tagName, cache = Element.extend.cache,
														  T = Element.Methods.ByTag;
														  
														  // extend methods for all tags (Safari doesn't need this)
														  if (!F.ElementExtensions) {
														  Object.extend(methods, Element.Methods),
														  Object.extend(methods, Element.Methods.Simulated);
														  }
														  
														  // extend methods for specific tags
														  if (T[tagName]) Object.extend(methods, T[tagName]);
														  
														  for (var property in methods) {
														  var value = methods[property];
														  if (typeof value == 'function' && !(property in element))
														  element[property] = cache.findOrStore(value);
														  }
														  
														  element._extended = Prototype.emptyFunction;
														  return element;
														  };
														  
														  Element.extend.cache = {
														  findOrStore: function(value) {
														  return this[value] = this[value] || function() {
														  return value.apply(null, [this].concat($A(arguments)));
														  }
														  }
														  };
														  
														  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).style.display = 'none';
														  return element;
														  },
														  
														  show: function(element) {
														  $(element).style.display = '';
														  return element;
														  },
														  
														  remove: function(element) {
														  element = $(element);
														  element.parentNode.removeChild(element);
														  return element;
														  },
														  
														  update: function(element, html) {
														  html = typeof html == 'undefined' ? '' : html.toString();
														  $(element).innerHTML = html.stripScripts();
														  setTimeout(function() {html.evalScripts()}, 10);
														  return element;
														  },
														  
														  replace: function(element, html) {
														  element = $(element);
														  html = typeof html == 'undefined' ? '' : html.toString();
														  if (element.outerHTML) {
														  element.outerHTML = html.stripScripts();
														  } else {
														  var range = element.ownerDocument.createRange();
														  range.selectNodeContents(element);
														  element.parentNode.replaceChild(
																						  range.createContextualFragment(html.stripScripts()), element);
														  }
														  setTimeout(function() {html.evalScripts()}, 10);
														  return element;
														  },
														  
														  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 $A($(element).getElementsByTagName('*')).each(Element.extend);
														  },
														  
														  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 (typeof selector == 'string')
														  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 expression ? Selector.findElement(ancestors, expression, index) :
														  ancestors[index || 0];
														  },
														  
														  down: function(element, expression, index) {
														  element = $(element);
														  if (arguments.length == 1) return element.firstDescendant();
														  var descendants = element.descendants();
														  return expression ? Selector.findElement(descendants, expression, index) :
														  descendants[index || 0];
														  },
														  
														  previous: function(element, expression, index) {
														  element = $(element);
														  if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
														  var previousSiblings = element.previousSiblings();
														  return expression ? Selector.findElement(previousSiblings, expression, index) :
														  previousSiblings[index || 0];
														  },
														  
														  next: function(element, expression, index) {
														  element = $(element);
														  if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
														  var nextSiblings = element.nextSiblings();
														  return expression ? Selector.findElement(nextSiblings, expression, index) :
														  nextSiblings[index || 0];
														  },
														  
														  getElementsBySelector: function() {
														  var args = $A(arguments), element = $(args.shift());
														  return Selector.findChildElements(element, args);
														  },
														  
														  getElementsByClassName: function(element, className) {
														  return document.getElementsByClassName(className, element);
														  },
														  
														  readAttribute: function(element, name) {
														  element = $(element);
														  if (Prototype.Browser.IE) {
														  if (!element.attributes) return null;
														  var t = Element._attributeTranslations;
														  if (t.values[name]) return t.values[name](element, name);
														  if (t.names[name])  name = t.names[name];
														  var attribute = element.attributes[name];
														  return attribute ? attribute.nodeValue : null;
														  }
														  return element.getAttribute(name);
														  },
														  
														  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 = $(element))) return;
														  var elementClassName = element.className;
														  if (elementClassName.length == 0) return false;
														  if (elementClassName == className ||
															  elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
														  return true;
														  return false;
														  },
														  
														  addClassName: function(element, className) {
														  if (!(element = $(element))) return;
														  Element.classNames(element).add(className);
														  return element;
														  },
														  
														  removeClassName: function(element, className) {
														  if (!(element = $(element))) return;
														  Element.classNames(element).remove(className);
														  return element;
														  },
														  
														  toggleClassName: function(element, className) {
														  if (!(element = $(element))) return;
														  Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
														  return element;
														  },
														  
														  observe: function() {
														  Event.observe.apply(Event, arguments);
														  return $A(arguments).first();
														  },
														  
														  stopObserving: function() {
														  Event.stopObserving.apply(Event, arguments);
														  return $A(arguments).first();
														  },
														  
														  // 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);
														  while (element = element.parentNode)
														  if (element == ancestor) return true;
														  return false;
														  },
														  
														  scrollTo: function(element) {
														  element = $(element);
														  var pos = Position.cumulativeOffset(element);
														  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) {
														  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, camelized) {
														  element = $(element);
														  var elementStyle = element.style;
														  
														  for (var property in styles)
														  if (property == 'opacity') element.setOpacity(styles[property])
														  else
														  elementStyle[(property == 'float' || property == 'cssFloat') ?
																	   (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') :
																	   (camelized ? property : property.camelize())] = 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 (window.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.style.overflow || 'auto';
														  if ((Element.getStyle(element, 'overflow') || 'visible') != '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;
														  }
														  };
														  
														  Object.extend(Element.Methods, {
																		childOf: Element.Methods.descendantOf,
																		childElements: Element.Methods.immediateDescendants
																		});
														  
														  if (Prototype.Browser.Opera) {
														  Element.Methods._getStyle = Element.Methods.getStyle;
														  Element.Methods.getStyle = function(element, style) {
														  switch(style) {
														  case 'left':
														  case 'top':
														  case 'right':
														  case 'bottom':
														  if (Element._getStyle(element, 'position') == 'static') return null;
														  default: return Element._getStyle(element, style);
														  }
														  };
														  }
														  else if (Prototype.Browser.IE) {
														  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) {
														  element = $(element);
														  var filter = element.getStyle('filter'), style = element.style;
														  if (value == 1 || value === '') {
														  style.filter = filter.replace(/alpha\([^\)]*\)/gi,'');
														  return element;
														  } else if (value < 0.00001) value = 0;
														  style.filter = filter.replace(/alpha\([^\)]*\)/gi, '') +
														  'alpha(opacity=' + (value * 100) + ')';
														  return element;
														  };
														  
														  // IE is missing .innerHTML support for TABLE-related elements
														  Element.Methods.update = function(element, html) {
														  element = $(element);
														  html = typeof html == 'undefined' ? '' : html.toString();
														  var tagName = element.tagName.toUpperCase();
														  if (['THEAD','TBODY','TR','TD'].include(tagName)) {
														  var div = document.createElement('div');
														  switch (tagName) {
														  case 'THEAD':
														  case 'TBODY':
														  div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
														  depth = 2;
														  break;
														  case 'TR':
														  div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
														  depth = 3;
														  break;
														  case 'TD':
														  div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
														  depth = 4;
														  }
														  $A(element.childNodes).each(function(node) { element.removeChild(node) });
														  depth.times(function() { div = div.firstChild });
														  $A(div.childNodes).each(function(node) { element.appendChild(node) });
														  } else {
														  element.innerHTML = html.stripScripts();
														  }
														  setTimeout(function() { html.evalScripts() }, 10);
														  return element;
														  }
														  }
														  else if (Prototype.Browser.Gecko) {
														  Element.Methods.setOpacity = function(element, value) {
														  element = $(element);
														  element.style.opacity = (value == 1) ? 0.999999 :
														  (value === '') ? '' : (value < 0.00001) ? 0 : value;
														  return element;
														  };
														  }
														  
														  Element._attributeTranslations = {
														  names: {
														  colspan:   "colSpan",
														  rowspan:   "rowSpan",
														  valign:    "vAlign",
														  datetime:  "dateTime",
														  accesskey: "accessKey",
														  tabindex:  "tabIndex",
														  enctype:   "encType",
														  maxlength: "maxLength",
														  readonly:  "readOnly",
														  longdesc:  "longDesc"
														  },
														  values: {
														  _getAttr: function(element, attribute) {
														  return element.getAttribute(attribute, 2);
														  },
														  _flag: function(element, attribute) {
														  return $(element).hasAttribute(attribute) ? attribute : null;
														  },
														  style: function(element) {
														  return element.style.cssText.toLowerCase();
														  },
														  title: function(element) {
														  var node = element.getAttributeNode('title');
														  return node.specified ? node.nodeValue : null;
														  }
														  }
														  };
														  
														  (function() {
														   Object.extend(this, {
																		 href: this._getAttr,
																		 src:  this._getAttr,
																		 type: this._getAttr,
																		 disabled: this._flag,
																		 checked:  this._flag,
																		 readonly: this._flag,
																		 multiple: this._flag
																		 });
														   }).call(Element._attributeTranslations.values);
														  
														  Element.Methods.Simulated = {
														  hasAttribute: function(element, attribute) {
														  var t = Element._attributeTranslations, node;
														  attribute = t.names[attribute] || attribute;
														  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.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 (tagName.constructor == Array) 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;
														  var cache = Element.extend.cache;
														  for (var property in methods) {
														  var value = methods[property];
														  if (!onlyIfAbsent || !(property in destination))
														  destination[property] = cache.findOrStore(value);
														  }
														  }
														  
														  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 (typeof klass == "undefined") continue;
														  copy(T[tag], klass.prototype);
														  }
														  }
														  
														  Object.extend(Element, Element.Methods);
														  delete Element.ByTag;
														  };
														  
														  var Toggle = { display: Element.toggle };
														  
/*--------------------------------------------------------------------------*/
														  
														  Abstract.Insertion = function(adjacency) {
														  this.adjacency = adjacency;
														  }
														  
														  Abstract.Insertion.prototype = {
														  initialize: function(element, content) {
														  this.element = $(element);
														  this.content = content.stripScripts();
														  
														  if (this.adjacency && this.element.insertAdjacentHTML) {
														  try {
														  this.element.insertAdjacentHTML(this.adjacency, this.content);
														  } catch (e) {
														  var tagName = this.element.tagName.toUpperCase();
														  if (['TBODY', 'TR'].include(tagName)) {
														  this.insertContent(this.contentFromAnonymousTable());
														  } else {
														  throw e;
														  }
														  }
														  } else {
														  this.range = this.element.ownerDocument.createRange();
														  if (this.initializeRange) this.initializeRange();
														  this.insertContent([this.range.createContextualFragment(this.content)]);
														  }
														  
														  setTimeout(function() {content.evalScripts()}, 10);
														  },
														  
														  contentFromAnonymousTable: function() {
														  var div = document.createElement('div');
														  div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
														  return $A(div.childNodes[0].childNodes[0].childNodes);
														  }
														  }
														  
														  var Insertion = new Object();
														  
														  Insertion.Before = Class.create();
														  Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
																									 initializeRange: function() {
																									 this.range.setStartBefore(this.element);
																									 },
																									 
																									 insertContent: function(fragments) {
																									 fragments.each((function(fragment) {
																													 this.element.parentNode.insertBefore(fragment, this.element);
																													 }).bind(this));
																									 }
																									 });
														  
														  Insertion.Top = Class.create();
														  Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
																								  initializeRange: function() {
																								  this.range.selectNodeContents(this.element);
																								  this.range.collapse(true);
																								  },
																								  
																								  insertContent: function(fragments) {
																								  fragments.reverse(false).each((function(fragment) {
																																 this.element.insertBefore(fragment, this.element.firstChild);
																																 }).bind(this));
																								  }
																								  });
														  
														  Insertion.Bottom = Class.create();
														  Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
																									 initializeRange: function() {
																									 this.range.selectNodeContents(this.element);
																									 this.range.collapse(this.element);
																									 },
																									 
																									 insertContent: function(fragments) {
																									 fragments.each((function(fragment) {
																													 this.element.appendChild(fragment);
																													 }).bind(this));
																									 }
																									 });
														  
														  Insertion.After = Class.create();
														  Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
																									initializeRange: function() {
																									this.range.setStartAfter(this.element);
																									},
																									
																									insertContent: function(fragments) {
																									fragments.each((function(fragment) {
																													this.element.parentNode.insertBefore(fragment,
																																						 this.element.nextSibling);
																													}).bind(this));
																									}
																									});
														  
/*--------------------------------------------------------------------------*/
														  
														  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);
/* 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();
														  
														  Selector.prototype = {
														  initialize: function(expression) {
														  this.expression = expression.strip();
														  this.compileMatcher();
														  },
														  
														  compileMatcher: function() {
														  // Selectors with namespaced attributes can't use the XPath version
														  if (Prototype.BrowserFeatures.XPath && !(/\[[\w-]*?:/).test(this.expression))
																									  return this.compileXPathMatcher();
																									  
																									  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(typeof c[i] == 'function' ? 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(typeof x[i] == 'function' ? 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;
																									  if (this.xpath) return document._getElementsByXPath(this.xpath, root);
																									  return this.matcher(root);
																									  },
																									  
																									  match: function(element) {
																									  return this.findElements(document).include(element);
																									  },
																									  
																									  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: "[@#{1}]",
																													attr: function(m) {
																													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 (typeof h === 'function') 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 or translate(text(), ' \t\r\n', '') = '')]",
																													'checked':     "[@checked]",
																													'disabled':    "[@disabled]",
																													'enabled':     "[not(@disabled)]",
																													'not': function(m) {
																													var e = m[6], p = Selector.patterns,
																													x = Selector.xpath, le, m, v;
																													
																													var exclusion = [];
																													while (e && le != e && (/\S/).test(e)) {
																													le = e;
																													for (var i in p) {
																													if (m = e.match(p[i])) {
																													v = typeof x[i] == 'function' ? 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 = false;',
																													attr: function(m) {
																													m[3] = (m[5] || m[6]);
																													return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); 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: /^\[([\w]+)\]/,
																																				  attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\]]*?)\4|([^'"][^\]]*?)))?\]/
																								   },
																								   
																								   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) {
																								   for (var i = 0, node; node = nodes[i]; i++)
																								   node._counted = true;
																								   return nodes;
																								   },
																								   
																								   unmark: function(nodes) {
																								   for (var i = 0, node; node = nodes[i]; i++)
																								   node._counted = 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._counted = true;
																								   if (reverse) {
																								   for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
																								   node = nodes[i];
																								   if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
																								   }
																								   } else {
																								   for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
																								   if (node.nodeType == 1 && (!ofType || node._counted)) 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])._counted) {
																								   n._counted = true;
																								   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, children = [], 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) {
																								   tagName = 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() == tagName) results.push(node);
																								   return results;
																								   } else return root.getElementsByTagName(tagName);
																								   },
																								   
																								   id: function(nodes, root, id, combinator) {
																								   var targetNode = $(id), h = Selector.handlers;
																								   if (!nodes && root == document) return targetNode ? [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) {
																								   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) {
																								   if (!nodes) nodes = root.getElementsByTagName("*");
																								   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._counted) {
																								   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 && !node.innerHTML.match(/^\s*$/))) 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._counted) 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) 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.startsWith(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() + '-'); }
																								   },
																								   
																								   matchElements: function(elements, expression) {
																								   var matches = new Selector(expression).findElements(), h = Selector.handlers;
																								   h.mark(matches);
																								   for (var i = 0, results = [], element; element = elements[i]; i++)
																								   if (element._counted) results.push(element);
																								   h.unmark(matches);
																								   return results;
																								   },
																								   
																								   findElement: function(elements, expression, index) {
																								   if (typeof expression == 'number') {
																								   index = expression; expression = false;
																								   }
																								   return Selector.matchElements(elements, expression || '*')[index || 0];
																								   },
																								   
																								   findChildElements: function(element, expressions) {
																								   var exprs = expressions.join(','), expressions = [];
																								   exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
																											  expressions.push(m[1].strip());
																											  });
																								   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;
																								   }
																								   });
															  
															  function $$() {
															  return Selector.findChildElements(document, $A(arguments));
															  }
															  var Form = {
															  reset: function(form) {
															  $(form).reset();
															  return form;
															  },
															  
															  serializeElements: function(elements, getHash) {
															  var data = elements.inject({}, function(result, element) {
																						 if (!element.disabled && element.name) {
																						 var key = element.name, value = $(element).getValue();
																						 if (value != null) {
																						 if (key in result) {
																						 if (result[key].constructor != Array) result[key] = [result[key]];
																						 result[key].push(value);
																						 }
																						 else result[key] = value;
																						 }
																						 }
																						 return result;
																						 });
															  
															  return getHash ? data : Hash.toQueryString(data);
															  }
															  };
															  
															  Form.Methods = {
															  serialize: function(form, getHash) {
															  return Form.serializeElements(Form.getElements(form), getHash);
															  },
															  
															  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) {
															  return $(form).getElements().find(function(element) {
																								return element.type != 'hidden' && !element.disabled &&
																								['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;
															  options.parameters = form.serialize(true);
															  
															  if (params) {
															  if (typeof params == 'string') params = params.toQueryParams();
															  Object.extend(options.parameters, params);
															  }
															  
															  if (form.hasAttribute('method') && !options.method)
															  options.method = form.method;
															  
															  return new Ajax.Request(form.readAttribute('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 Hash.toQueryString(pair);
															  }
															  }
															  return '';
															  },
															  
															  getValue: function(element) {
															  element = $(element);
															  var method = element.tagName.toLowerCase();
															  return Form.Element.Serializers[method](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.blur();
															  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) {
															  switch (element.type.toLowerCase()) {
															  case 'checkbox':
															  case 'radio':
															  return Form.Element.Serializers.inputSelector(element);
															  default:
															  return Form.Element.Serializers.textarea(element);
															  }
															  },
															  
															  inputSelector: function(element) {
															  return element.checked ? element.value : null;
															  },
															  
															  textarea: function(element) {
															  return element.value;
															  },
															  
															  select: function(element) {
															  return this[element.type == 'select-one' ?
																		  'selectOne' : 'selectMany'](element);
															  },
															  
															  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 = function() {}
															  Abstract.TimedObserver.prototype = {
															  initialize: function(element, frequency, callback) {
															  this.frequency = frequency;
															  this.element   = $(element);
															  this.callback  = callback;
															  
															  this.lastValue = this.getValue();
															  this.registerCallback();
															  },
															  
															  registerCallback: function() {
															  setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
															  },
															  
															  onTimerEvent: function() {
															  var value = this.getValue();
															  var changed = ('string' == typeof this.lastValue && 'string' == typeof value
																			 ? this.lastValue != value : String(this.lastValue) != String(value));
															  if (changed) {
															  this.callback(this.element, value);
															  this.lastValue = value;
															  }
															  }
															  }
															  
															  Form.Element.Observer = Class.create();
															  Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
																											  getValue: function() {
																											  return Form.Element.getValue(this.element);
																											  }
																											  });
															  
															  Form.Observer = Class.create();
															  Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
																									  getValue: function() {
																									  return Form.serialize(this.element);
																									  }
																									  });
															  
/*--------------------------------------------------------------------------*/
															  
															  Abstract.EventObserver = function() {}
															  Abstract.EventObserver.prototype = {
															  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.bind(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();
															  Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
																												   getValue: function() {
																												   return Form.Element.getValue(this.element);
																												   }
																												   });
															  
															  Form.EventObserver = Class.create();
															  Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
																										   getValue: function() {
																										   return Form.serialize(this.element);
																										   }
																										   });
															  if (!window.Event) {
															  var Event = new Object();
															  }
															  
															  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,
																			
																			element: function(event) {
																			return $(event.target || event.srcElement);
																			},
																			
																			isLeftClick: function(event) {
																			return (((event.which) && (event.which == 1)) ||
																					((event.button) && (event.button == 1)));
																			},
																			
																			pointerX: function(event) {
																			return event.pageX || (event.clientX +
																								   (document.documentElement.scrollLeft || document.body.scrollLeft));
																			},
																			
																			pointerY: function(event) {
																			return event.pageY || (event.clientY +
																								   (document.documentElement.scrollTop || document.body.scrollTop));
																			},
																			
																			stop: function(event) {
																			if (event.preventDefault) {
																			event.preventDefault();
																			event.stopPropagation();
																			} else {
																			event.returnValue = false;
																			event.cancelBubble = true;
																			}
																			},
																			
																			// find the first node with the given tagName, starting from the
																			// node the event was triggered on; traverses the DOM upwards
																			findElement: function(event, tagName) {
																			var element = Event.element(event);
																			while (element.parentNode && (!element.tagName ||
																										  (element.tagName.toUpperCase() != tagName.toUpperCase())))
																			element = element.parentNode;
																			return element;
																			},
																			
																			observers: false,
																			
																			_observeAndCache: function(element, name, observer, useCapture) {
																			if (!this.observers) this.observers = [];
																			if (element.addEventListener) {
																			this.observers.push([element, name, observer, useCapture]);
																			element.addEventListener(name, observer, useCapture);
																			} else if (element.attachEvent) {
																			this.observers.push([element, name, observer, useCapture]);
																			element.attachEvent('on' + name, observer);
																			}
																			},
																			
																			unloadCache: function() {
																			if (!Event.observers) return;
																			for (var i = 0, length = Event.observers.length; i < length; i++) {
																			Event.stopObserving.apply(this, Event.observers[i]);
																			Event.observers[i][0] = null;
																			}
																			Event.observers = false;
																			},
																			
																			observe: function(element, name, observer, useCapture) {
																			element = $(element);
																			useCapture = useCapture || false;
																			
																			if (name == 'keypress' &&
																				(Prototype.Browser.WebKit || element.attachEvent))
																			name = 'keydown';
																			
																			Event._observeAndCache(element, name, observer, useCapture);
																			},
																			
																			stopObserving: function(element, name, observer, useCapture) {
																			element = $(element);
																			useCapture = useCapture || false;
																			
																			if (name == 'keypress' &&
																				(Prototype.Browser.WebKit || element.attachEvent))
																			name = 'keydown';
																			
																			if (element.removeEventListener) {
																			element.removeEventListener(name, observer, useCapture);
																			} else if (element.detachEvent) {
																			try {
																			element.detachEvent('on' + name, observer);
																			} catch (e) {}
																			}
																			}
																			});
															  
/* prevent memory leaks in IE */
															  if (Prototype.Browser.IE)
															  Event.observe(window, 'unload', Event.unloadCache, false);
															  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;
															  },
															  
															  realOffset: function(element) {
															  var valueT = 0, valueL = 0;
															  do {
															  valueT += element.scrollTop  || 0;
															  valueL += element.scrollLeft || 0;
															  element = element.parentNode;
															  } while (element);
															  return [valueL, valueT];
															  },
															  
															  cumulativeOffset: function(element) {
															  var valueT = 0, valueL = 0;
															  do {
															  valueT += element.offsetTop  || 0;
															  valueL += element.offsetLeft || 0;
															  element = element.offsetParent;
															  } while (element);
															  return [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=='BODY') break;
															  var p = Element.getStyle(element, 'position');
															  if (p == 'relative' || p == 'absolute') break;
															  }
															  } while (element);
															  return [valueL, valueT];
															  },
															  
															  offsetParent: 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;
															  },
															  
															  // 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 = this.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 = this.realOffset(element);
															  
															  this.xcomp = x + offsetcache[0] - this.deltaX;
															  this.ycomp = y + offsetcache[1] - this.deltaY;
															  this.offset = this.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;
															  },
															  
															  page: 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)
															  if (Element.getStyle(element,'position')=='absolute') break;
															  
															  } while (element = element.offsetParent);
															  
															  element = forElement;
															  do {
															  if (!window.opera || element.tagName=='BODY') {
															  valueT -= element.scrollTop  || 0;
															  valueL -= element.scrollLeft || 0;
															  }
															  } while (element = element.parentNode);
															  
															  return [valueL, valueT];
															  },
															  
															  clone: function(source, target) {
															  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 = Position.page(source);
															  
															  // find coordinate system to use
															  target = $(target);
															  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(target,'position') == 'absolute') {
															  parent = Position.offsetParent(target);
															  delta = Position.page(parent);
															  }
															  
															  // 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)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
															  if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
															  if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
															  if(options.setHeight) target.style.height = source.offsetHeight + 'px';
															  },
															  
															  absolutize: function(element) {
															  element = $(element);
															  if (element.style.position == 'absolute') return;
															  Position.prepare();
															  
															  var offsets = Position.positionedOffset(element);
															  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';
															  },
															  
															  relativize: function(element) {
															  element = $(element);
															  if (element.style.position == 'relative') return;
															  Position.prepare();
															  
															  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;
															  }
															  }
															  
															  // Safari returns margins on body which is incorrect if the child is absolutely
															  // positioned.  For performance reasons, redefine Position.cumulativeOffset for
															  // KHTML/WebKit only.
															  if (Prototype.Browser.WebKit) {
															  Position.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 [valueL, valueT];
															  }
															  }
															  
															  Element.addMethods();