window.addEvent('domready', function(){	
	var list = $$('.nav_dropdown');
	list.each(function(element) {	
		element.navLink = $E('a', element);
		$E('ul', element).setStyle('display', 'block');
		element.slide = new Fx.Slide($E('ul', element), {duration: 500, wait: false}).hide();
		element.addEvents({
			mouseenter: function() {element.navLink.className='nav_active'; element.slide.slideIn();},
			mouseleave: function() {element.slide.slideOut(); element.navLink.className='';}
		});
	});
});