window.addEvent('domready', function(){
	$('nav_dd').getElements('li.nav_dd_parent').each( function( elem ){
		var list = elem.getElement('ul.nav_dd_children');
		var myFx = new Fx.Slide(list).hide();
		elem.addEvents({
			'mouseenter' : function(){
				myFx.cancel();
				myFx.slideIn();
			},
			'mouseleave' : function(){
				myFx.cancel();
				myFx.slideOut();
			}
		});
	})
});