var Combobox = function()
{
	var EventColl = [];
	var counter = 0;

	function Event()
	{
		var self = this;

		this.addEvent = function(oElement, handler, callback, capture)
		{
			if (oElement.addEventListener)
			{
				oElement.addEventListener(handler, callback, capture);
			}
			else if(oElement.attachEvent)
			{
				var prop = [handler, callback].join("");
				if (oElement[prop]) return;

				if (!EventColl[oElement._eventid])
				{
					oElement._eventid = counter++;
					EventColl[oElement._eventid] = {'oElement' : oElement};
				}
				EventColl[oElement._eventid][prop] = [handler, callback];

				oElement[prop] = function()
				{
					callback.call(oElement, event);
				};
				oElement.attachEvent('on' + handler, oElement[prop]);
			}
		};

		this.removeEvent = function(oElement, handler, callback, capture)
		{
			if (oElement.removeEventListener)
			{
				oElement.removeEventListener(handler, callback, capture);
			}
			else if (oElement.detachEvent)
			{
				var prop = [handler, callback].join("");
				if (oElement[prop])
				{
					oElement.detachEvent('on' + handler, oElement[prop]);
					oElement[prop] = null;
					EventColl[oElement._eventid][prop] = null;
				}
			}
		};

		function breakEventLeak()
		{
			var curr = null;
			var j = null;
			for (var i = 0, len = EventColl.length; i < len; i++)
			{
				curr = EventColl[i];
				for (j in curr)
				{
					if (j != 'oElement')
					{
						self.removeEvent(curr.oElement, curr[j][0], curr[j][1]);
					}
				}
				curr.oElement._eventid = null;
			}
			EventColl = null;
			counter = null;
		}
		//if (window.attachEvent) window.attachEvent('onunload', breakEventLeak);
	}
	return new Event();
}();

Combobox.preventDefault = function(event)
{
	event.returnValue = false;
	if (event.preventDefault)
	{
		event.preventDefault();
	}
}

Combobox.stopPropagation = function(event)
{
	if (event.stopPropagation)
	{
		event.stopPropagation();
		return;
	}
	event.cancelBubble = true;
}

/*
	- Implements optgroup
	- Implements remove Option
	- Implements parse html select
	-Fix selected for IE
	-Implements disabled select
*/


function getOffsetElement(element)
{
	var top = left = 0;
	while(element)
	{
		top += element.offsetTop;
		left += element.offsetLeft;
		element = element.offsetParent;
	}

	var offset = [left, top];
	return offset;
}

function OptionItem(properties)
{
	var option = document.createElement('option');
	for (var i in properties)
	{
		option[i] = properties[i];
	}

	return option;
}

var ComboBox = function()
{
	var instance = false;
	var instance_coll = [];

	function ComboBox(properties, html_select)
	{
		var custom_combo_box = document.createElement('div');
			custom_combo_box.className = properties.className || 'comboBox';
			if (properties.width) custom_combo_box.style.width = properties.width + 'px';
			if (properties.height) custom_combo_box.style.height = properties.height + 'px';
			custom_combo_box.innerHTML = '<span class="dd_arrow"></span><label></label>';

		var combo_box = html_select || document.createElement('select');
			combo_box.className = 'hidden_component';
			if (properties.name) combo_box.name = properties.name;
			if (properties.id) combo_box.id = properties.id;
			if (properties.onChange || html_select.onchange) combo_box.onchange_listener = html_select.onchange || properties.onChange;
			combo_box.custom_combo_box = custom_combo_box;
			custom_combo_box.select = combo_box;
		var curr_parent = combo_box;

		this.addOption = function(OptionItem)
		{
			if (window.addEventListener)
			{
				curr_parent.appendChild(OptionItem);
				return;
			}
			combo_box.add(OptionItem);
		}

		/*this.addOptgroup = function(label_text)
		{
			curr_parent = document.createElement('optgroup');
			curr_parent.label = label_text || '';
			combo_box.appendChild(curr_parent);
		}*/

		this.flushOptions = function()
		{
			combo_box.options.length = 0;
		}

		this.renderComboBox = function(parentCombo,real_select)
		{
			var parent_combobox = document.getElementById(parentCombo) || parentCombo;
			ComboBox.setUpdateText.call(combo_box, null, true);

			if (combo_box.addEventListener)
			{
				combo_box.addEventListener('keyup', combo_box.blur, false);
				combo_box.addEventListener('keyup', combo_box.focus, false);
			}

			Combobox.addEvent(combo_box, 'change', ObserverDropDown.moveKeySelected, false);
			Combobox.addEvent(combo_box, 'change', ComboBox.setUpdateText, false);
			Combobox.addEvent(combo_box, 'keydown', ObserverDropDown.checkKey, false);
			Combobox.addEvent(combo_box, 'focus', ComboBox.focus, false);
			Combobox.addEvent(combo_box, 'blur', ComboBox.blur, false);

			//parent_combobox.appendChild(combo_box);
			parent_combobox.insertBefore(combo_box, real_select.nextSibling);

			Combobox.addEvent(custom_combo_box, 'click', ObserverDropDown.showDropDown, false);

			//parent_combobox.appendChild(custom_combo_box);
			parent_combobox.insertBefore(custom_combo_box, combo_box.nextSibling);
		}

		if (!instance)
		{
			if (document.body)
			{
				ObserverDropDown.initDropDown();
			}
			else
			{
				Event.addEvent(window, 'load', ObserverDropDown.initDropDown, false);
			}

			instance = true;
		}

		if (!window.XMLHttpRequest)
		{
			instance_coll[instance_coll.length] = custom_combo_box;
		}
	}

	/*Prevent memory leak in IE6*/
	if (!window.XMLHttpRequest)
	{
		window.attachEvent('onunload', function()
		{
			for (var i = 0, len = instance_coll.length; i < len; i++)
			{
				instance_coll[i].select.custom_combo_box = null;
				instance_coll[i].select = null;
			}
		});
	}

	return ComboBox;
}();

ComboBox.setUpdateText = function(event, onchange_flag)
{
	if (this.selectedIndex >= 0)
	{
		var option = this.options[this.selectedIndex];
		this.custom_combo_box.getElementsByTagName('label')[0].innerHTML =
		(option.title ? '<img src="' + option.title + '" alt="" />' : '') + option.text;
		if (!onchange_flag && this.onchange_listener instanceof Function)
		{
			this.onchange_listener(this);
		}
	}
}

ComboBox.setSelectedIndex = function(index)
{
	if (index >= 0)
	{
		this.selectedIndex = index;
		ComboBox.setUpdateText.call(this);
	}
}

ComboBox.focus = function()
{
	this.custom_combo_box.getElementsByTagName('label')[0].className = 'combo_box_focus'
}

ComboBox.blur = function()
{
	this.custom_combo_box.getElementsByTagName('label')[0].className = '';
}

var ObserverDropDown = function()
{
	function ObserverDropDown()
	{
		var drop_down_id = 'dropDownComboBox';
		var selected_class_name = 'selected_index';

		var drop_down = null;
		var curr_combo_box = null;
		var default_selected_index = null;
		var old_selected_index = null;
		var self = this;

		this.initDropDown = function()
		{
			drop_down = document.createElement('div');
				drop_down.id = drop_down_id;
			var drop_down_style = drop_down.style;
				drop_down_style.position = 'absolute';
				drop_down_style.zIndex = '100000';
				drop_down_style.display = 'none';

				Combobox.addEvent(drop_down, 'scroll', self.focusSelect, false);

			document.body.appendChild(drop_down);
		}

		this.showDropDown = function(event)
		{
			var scroll = document.documentElement.scrollTop;
			if (typeof scroll != 'undefined')
			{
				this.select.style.top = scroll + 'px';
			}

			this.select.focus();
			if (this != curr_combo_box)
			{
				curr_combo_box = this;
				default_selected_index = old_selected_index = curr_combo_box.select.selectedIndex;
				positionResizeDropDown();
				renderOptions();
				drop_down.style.display = 'block';
				drop_down.scrollTop = getSelectedOffset();
				Combobox.stopPropagation(event);

				curr_combo_box.style.position = 'relative';
				curr_combo_box.style.zIndex = '1000';
				Combobox.addEvent(document, 'click', self.hideDropDown, false);
				Combobox.addEvent(window, 'resize', self.hideDropDown, false);
			}
		}

		this.hideDropDown = function(event)
		{
			drop_down.style.display = 'none';
			if (curr_combo_box)
			{
				if (curr_combo_box.select.selectedIndex != default_selected_index)
				{
					curr_combo_box.select.selectedIndex = default_selected_index;
				}
				curr_combo_box.select.focus();
				curr_combo_box = null;
				Combobox.removeEvent(document, 'click', self.hideDropDown, false);
				Combobox.removeEvent(window, 'resize', self.hideDropDown, false);
			}
		}

		this.moveSelected = function(index)
		{
			if (index != old_selected_index)
			{
				var obj = drop_down.getElementsByTagName('label');
				obj[old_selected_index].className = '';
				obj[index].className = selected_class_name;
				curr_combo_box.select.selectedIndex = old_selected_index = index;
			}
		}

		this.moveKeySelected = function()
		{
			if (curr_combo_box)
			{
				default_selected_index = curr_combo_box.select.selectedIndex;
				self.moveSelected(default_selected_index);
				drop_down.scrollTop = getSelectedOffset();
			}
		}

		this.setSelectedIndex = function(index)
		{
			default_selected_index = index;
			ComboBox.setSelectedIndex.call(curr_combo_box.select, index);
		}

		this.checkKey = function(event)
		{
			var code = event.keyCode;
			if (curr_combo_box && (code == 9 || code == 13))
			{
				self.hideDropDown();
			}
		}

		this.focusSelect = function()
		{
			curr_combo_box.select.focus();
		}

		function positionResizeDropDown()
		{
			var pos = getOffsetElement(curr_combo_box);
			drop_down.style.left = pos[0] + 'px';
			drop_down.style.top = pos[1] + curr_combo_box.offsetHeight + 'px';
			drop_down.style.width = curr_combo_box.offsetWidth + - 2 + 'px';
		}

		function getSelectedOffset()
		{
			if (default_selected_index > -1)
			{
				var obj = drop_down.getElementsByTagName('label')[curr_combo_box.select.selectedIndex];
				var scroll = drop_down.scrollTop;
				var obj_top = obj.offsetTop;
				var obj_height = obj.offsetHeight;

				if (obj_top < scroll)
				{
					return obj_top;
				}

				if (obj_top > scroll + drop_down.offsetHeight - obj_height)
				{
					return obj_top - (drop_down.offsetHeight - obj_height);
				}
				return scroll;
			}
		}

		function renderOptions()
		{
			var index = -1;
			var option = null;
			function replaceOption(match)
			{
				index++;
				option = curr_combo_box.select.options[index];
				return '<label onmouse' + (window.ActiveXObject ? 'over' : 'move') + '=ObserverDropDown.moveSelected(' + index + ') onclick=ObserverDropDown.setSelectedIndex(' + index + ')>' +
				(option.title ? '<img src="' + option.title + '" alt="" />' : '');
			}

			var html_code = curr_combo_box.select.innerHTML;
			html_code = html_code.replace(/<option[^>]*>/ig, replaceOption);
			html_code = html_code.replace(/<\/option/ig, '</label');
			drop_down.innerHTML = html_code;
			if (index > -1)
			{
				drop_down.getElementsByTagName('label')[curr_combo_box.select.selectedIndex].className = selected_class_name;
			}

		}

	}

	return new ObserverDropDown();
}();

function Checkbox(name, value, checked, id)
{
	this.button = null;
	this.button_flag = false;
	if (arguments.length > 1)
	{
		this.initializedComponent();
		this.button.className = 'hidden_component';
		this.button.name = name;
		this.button.value = value;
		this.button.id = id;
		this.checked = checked;
		this.button.defaultChecked = checked;
	}
	if (arguments[0])
	{
		this.button = arguments[0];
		this.button.className = 'hidden_component';
		this.checked = this.button.checked;
		this.button_flag = true;
	}
	if (arguments.length)
	{
		this.custom_button = document.createElement('span');
		this.custom_button.par_button = this.button;
		this.custom_button.className = 'checkbox' + (this.checked ? ' ch_checked' : '');
		this.custom_button.onclick = function(){this.par_button.click();};
		
		this.button.custom_button = this.custom_button;
		this.changeCheckedListener();
	}
}

Checkbox.prototype.changeCheckedListener = function()
{
	this.button.onclick = function()
	{
		this.custom_button.className = 'checkbox' + (this.checked ? ' ch_checked' : '');
	}
}

Checkbox.prototype.writeComponent = function(id_element)
{
	var obj = document.getElementById(id_element) || id_element;
	if (!this.button_flag) obj.appendChild(this.button);
	obj.insertBefore(this.custom_button, this.button);
}

Checkbox.prototype.initializedComponent = function()
{
	this.button = document.createElement('input');
	this.button.type = 'checkbox';
}
	
var radio_button_reference = [];
function changeRadioButtonChecked(sender)
{
	if (radio_button_reference[sender.name]) 
	{
		radio_button_reference[sender.name].custom_button.className = 'radio';
		radio_button_reference[sender.name].checked = false;
		radio_button_reference[sender.name].defaultChecked = false;
	}
	
	sender.checked = sender.defaultChecked = true;
	sender.custom_button.className = 'radio r_checked';
	radio_button_reference[sender.name] = sender;
}

RadioButton.prototype = new Checkbox;
RadioButton.constructor = RadioButton;

function RadioButton(name, value, checked, id)
{
	Checkbox.call(this, name, value, checked, id);
	this.custom_button.className = 'radio';
	if (this.checked)
	{
		changeRadioButtonChecked(this.button);
	}
}

RadioButton.prototype.changeCheckedListener = function()
{
	this.button.onclick = function()
	{
		changeRadioButtonChecked(this);
	}
}

RadioButton.prototype.initializedComponent = function()
{
	this.button = document.createElement((!window.ActiveXObject ? 'input' : '<input type="radio">'));
	this.button.type = 'radio';
}
/*end radio button and checkbox*/


function parseFormElements()
{

	var obj = document.getElementById('lang').getElementsByTagName('select');
	var felem = null;
	var combo_box = null;
	for (var i = 0, len = obj.length; i < len; i++)
	{
		if (!obj[i].multiple)
		{
			combo_box = new ComboBox({'className' : obj[i].className}, obj[i]);
			combo_box.renderComboBox(obj[i].parentNode,obj[i]);
		}
	}

	obj = document.getElementsByTagName('input');
	for (var i = 0, len = obj.length; i < len; i++)
	{
		if (obj[i].type.toLowerCase() == 'radio')
		{
			new RadioButton(obj[i]).writeComponent(obj[i].parentNode);
		}
		if (obj[i].type.toLowerCase() == 'checkbox')
		{
			new Checkbox(obj[i]).writeComponent(obj[i].parentNode);
		}
	}
}
Combobox.addEvent(window, 'load', parseFormElements, false);