var MNUtimeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;

// open hidden layer
function mnuopen(id)
{	
	// cancel close timer
	mnucancelclosetime();

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

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mnuclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mnuclosetime()
{
	closetimer = window.setTimeout(mnuclose, MNUtimeout);
}

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

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