var timeout	= 500;
var closetimer	= 0;
var pMenuItem	= null;

// open menu
function menuopen(sId)
{	
	// cancel delay-timer
	menucanceldelay();

	// close old layer
	if (pMenuItem) pMenuItem.style.visibility = 'hidden';

	// get new menu and show it
	pMenuItem = document.getElementById(sId);
	if (pMenuItem) pMenuItem.style.visibility = 'visible';

}
// close menu
function menuclose()
{
	if(pMenuItem) pMenuItem.style.visibility = 'hidden';
}

// set close timer
function menudelay()
{
	closetimer = window.setTimeout(menuclose, timeout);
}

// cancel close timer
function menucanceldelay()
{
	if (closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = menuclose;