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

function navbar_open() {
	navbar_canceltimer();
	navbar_close();
	ddmenuitem = $(this).find('ul').eq(0).css('visibility','visible');
}
function navbar_close() {
	if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
}
function navbar_timer() {
	closetimer = window.setTimeout(navbar_close, timeout);
}
function navbar_canceltimer() {
	if (closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
$(document).ready(function() {
	$('#navbar > li').bind('mouseover', navbar_open);
	$('#navbar > li').bind('mouseout',  navbar_timer);
});
document.onclick = navbar_close;