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

	//event listener fade in
	$('top-nav').getElements('li').addEvent('mouseenter', function(e){
		if(this.getElement('ul')){
			var dropdown = this.getElement('ul').setStyles({
					display:'block',
					opacity: 0
				});
					
				//new Fx.Style(div2, 'opacity', {duration: 700}).start(1);
				dropdown.fade('in');
		}
	});
	
	//event listener fade out
	$('top-nav').getElements('li').addEvent('mouseleave', function(e){
		if(this.getElement('ul')){
			var dropdown = this.getElement('ul').setStyles({
					display:'block',
					opacity: 1
				});
					
				//new Fx.Style(div2, 'opacity', {duration: 700}).start(1);
				dropdown.fade('out');
			}
	});
 
});