$(document).ready(function(){
	$('li.firstLevel').hover(
		function() {
			var submenu = $(this).children('ul');
			submenu.stop();
			submenu.css({display: 'none', height : '', overflow : ''});
			submenu.slideDown('slow');
		},
		function() {
			var submenu = $(this).children('ul');
			submenu.stop();
			submenu.slideUp('slow');
		}
	);
});