var menuItem = 0;
var timeOut = 0;
var timer = 0;

function menuOpen(ID)
{	
	menuCancelCloseTime();

	if(menuItem) menuItem.style.visibility = 'hidden';

	menuItem = document.getElementById(ID);
	menuItem.style.visibility = 'visible';
}

function menuCloseTime()
{
	timer = window.setTimeout(menuClose, timeOut);
}

function menuCancelCloseTime()
{
	if(timer)
	{
		window.clearTimeout(timer);
		timer = null;
	}
}

function menuClose()
{
	if(menuItem) menuItem.style.visibility = 'hidden';
}

document.onclick = menuClose;