var menutimeout = 500;
var closetimer  = 0;
var menuitem    = 0;

$(document).ready(function() {
	$('#menu > li').bind('mouseover', menu_open);
	$('#menu > li').bind('mouseout', menu_timer);
});
document.onclick = menu_close;

function menu_open()
{
	menu_canceltimer();
	menu_close();
	menuitem = $(this).find('ul').css('visibility', 'visible');
}

function menu_close()
{
	if (menuitem)
		menuitem.css('visibility', 'hidden');
}

function menu_timer()
{
	closetimer = window.setTimeout(menu_close, menutimeout);
}

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