window.addEvent('domready', function(){
			$$('#nav_links a').each(function(el){
				if(el.rel && el.href && el.rel.test('^sub', 'i')) {
					var el2 = el.getNext();

					if(el2 && el2.hasClass('popup_nav')) {

						var fx = new Fx.Styles(el2, {duration: 300, wait:false});

						el2.setStyle('top', el.getTop() + 'px');
						el2.setStyle('left', '161px');
						el2.setStyle('display', 'block');
						
						fx.set({'opacity': 0});

						el.getParent().addEvent('mouseenter', function (e) {
							new Event(e).stop();
							fx.start({'opacity': 1});
						});
						el.getParent().addEvent('mouseleave', function (e) {
							new Event(e).stop();
							fx.start({'opacity' : 0});
						});
					}
				}
		    });
		});