var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;

function nav_open()
{	nav_canceltimer();
	nav_close();
	ddmenuitem = $(this).find('ul').eq(0).css('visibility', 'visible');}

function nav_close()
{	if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}

function nav_timer()
{	closetimer = window.setTimeout(nav_close, timeout);}

function nav_canceltimer() {
	if(closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

	$().ready(function(){
		$('#menu > li').bind('mouseover', nav_open);
		$('#menu > li').bind('mouseout',  nav_timer);
	});