Element.extend(
	{
		hide: function() 
		{
			return this.setStyle('display', 'none');
		},
		
		show: function() 
		{
			return this.setStyle('display', '');
		}
	});

	var DropdownMenu = new Class({	
		initialize: function(element)
		{
			$A($(element).childNodes).each(function(el)
			{
				if(el.nodeName.toLowerCase() == 'li')
				{
					$A($(el).childNodes).each(function(el2)
					{
						if(el2.nodeName.toLowerCase() == 'ul')
						{
							$(el2).hide();
							
							el.addEvent('mouseover', function()
							{
								el2.show();
								return false;
							});
	
							el.addEvent('mouseout', function()
							{
								el2.hide();
							});
							new DropdownMenu(el2);
						}
					});
				}
			});
			return this;
		}
	});
	
	window.addEvent('domready', function() { new DropdownMenu($('main_menu'))});