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	window.addEvent('domready', function(){
		$('drop_down_menu').getElements('li.menu').each( function( elem ){
			var list = elem.getElement('ul.links');	
			var myFx = new Fx.Slide(list).hide();			
			elem.addEvents({
				'mouseenter' : function(){ 					
					myFx.cancel();
					myFx.slideIn();
                   //默认是myFx.slideIn('vertical');		
 
				},
				'mouseleave' : function(){ 
					myFx.cancel();
					myFx.slideOut();	
                   //默认是myFx.slideOut('vertical');				
				}
			});	
		})
	});

window.addEvent('domready', function(){ $('drop_down_menu').getElements('li.menu').each( function( elem ){ var list = elem.getElement('ul.links'); var myFx = new Fx.Slide(list).hide(); elem.addEvents({ 'mouseenter' : function(){ myFx.cancel(); myFx.slideIn(); //默认是myFx.slideIn('vertical'); }, 'mouseleave' : function(){ myFx.cancel(); myFx.slideOut(); //默认是myFx.slideOut('vertical'); } }); }) });