var timeout         = 500;
var closetimer		= 0;
var menuUL      = 0;

function menu_open()
{
	menu_canceltimer();
	menu_close();
	menuUL = $(this).find('ul').eq(0).css('display', 'block');
}

function menu_close()
{
	if(menuUL) menuUL.css('display', 'none');
}

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

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

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

document.onclick = menu_close;