var timeout	= 500;
var closetimer	= 0;
var menuitem	= 0;
		
function menuOpen(id)
{	
	menuCancelCloseTime();			
	if(menuitem) menuitem.style.visibility = 'hidden';
			
	menuitem = document.getElementById(id);
	menuitem.style.visibility = 'visible';
}
		
function menuClose()
{
	if(menuitem) menuitem.style.visibility = 'hidden';
}

function menuCloseTime()
{
	closetimer = window.setTimeout(menuClose, timeout);
}

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


document.onclick = menuClose;