var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;
 
function topmenu_open()
{	topmenu_canceltimer();
	topmenu_close();
	ddmenuitem = $(this).find('ul').eq(0).css('visibility', 'visible');}
 
function topmenu_close()
{	if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}
 
function topmenu_timer()
{	closetimer = window.setTimeout(topmenu_close, timeout);}
 
function topmenu_canceltimer()
{	if(closetimer)
	{	window.clearTimeout(closetimer);
		closetimer = null;}}
 
$(document).ready(function()
{	$('#topmenu > li').bind('mouseover', topmenu_open);
	$('#topmenu > li').bind('mouseout',  topmenu_timer);});