window.addEvent('domready', function() {
	

	$('main_menu').getElements('li.menu').each(function(menu){ 
				
			var dropMenu = menu.getElement('ul.drop_menu');
			var myVerticalSlide = new Fx.Slide(dropMenu, {
				duration: 90,
				transition: Fx.Transitions.Expo.easeIn 
			}).hide();	
			
	
			menu.addEvents({
						   
			'mouseenter': function(){
				myVerticalSlide.slideIn();
			},
			'mouseleave': function(){
				myVerticalSlide.slideOut();
			}
			
			});
		});

});