//http://www.queness.com/preview/1047/easy-to-style-jquery-drop-down-menu-tutorial
$(document).ready(function () {	
	
	$('#nav li').hover(
		function () {
			//show its submenu
			$('ul', this).slideDown(100);

		}, 
		function () {
			//hide its submenu
			$('ul', this).slideUp(100);			
		}
	);
	
});