window.addEvent
(
	'domready',
	function()
	{
		pngfix();
		var menus = $$("#top_menu .parent_drop");
		var submenus = $$("#top_menu .parent_drop .drop_menu");
		submenus.each
		(
		 	function(submenu, i)
			{
				submenu.setOpacity(0);
				submenu.setStyle('display', 'block');
			}
		);
		menus.each
		(
		 	function(menu, i)
			{
				menu.addEvent
				(
				 	"mouseenter",
					function(event)
					{
						var fx = new Fx.Styles
						(
						 	submenus[i], 
							{
								duration: 300, 
								wait: false
							}
						);
						fx.start
						(
						 	{
								'opacity': 1
							}
						);
					}
				);
				menu.addEvent
				(
				 	"mouseleave",
					function(event)
					{
						var fx = new Fx.Styles
						(
						 	submenus[i], 
							{
								duration: 300, 
								wait: 100
							}
						);
						fx.start
						(
						 	{
								'opacity': 0
							}
						);
					}
				);
			}
		);
	}
);