var Top_menu = new Class
	({
		top_menu: null,
		items: null,
		selected: null,
	
		initialize: function()
		{
			this.top_menu = $('top_menu');
			
			if(!this.top_menu)
				return 0;
			
			this.items = this.top_menu.getElements('div.item')
								.addEvents({
								    'mouseenter': this.onEnter.bind(this),
								    'mouseleave': this.onLeave.bind(this)
								});
		},
		
		onEnter: function(event)
		{
			if(this.selected)
				this.selected.addClass('hide');
			
			this.selected = event.target.getElement('.subMenu');
			
			if(this.selected)
				this.selected.removeClass('hide');
		},

		onLeave: function(event)
		{
			if(this.selected)
				this.selected.addClass('hide');
		}
	})