/*  Prototype JavaScript framework, version 1.5.1
 *  (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',

  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[^>]*>([\u0001-\uFFFF]*?)</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}');
  },

  evalJSON: function(sanitize) {
	var json = this.unfilterJSON();
	try {
	  if (!sanitize || (/^("(\\.|[^"\\\n\r])*?"|[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t])+?$/.test(json)))
		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;
  for (var i = 0, length = children.length; i < length; i++) {
	child = children[i];
	if (Element.hasClassName(child, className))
	  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();