var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

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

	// get new layer and show it
	// ALT ddmenuitem = document.getElementById(id);
	var pn = id.parentNode;
	if (pn.hasChildNodes())
	{
		for (var i = 0; i < pn.childNodes.length; i++)
		{
			if (pn.childNodes[i].nodeName == "UL")
			{
				var ul_elem = pn.childNodes[i];
				var li_elem = ul_elem.firstChild;

				ddmenuitem = li_elem.firstChild;  /* das Element, das aufgeklappt werden soll */
				ddmenuitem.style.visibility = 'visible';
			}
		}
	}
}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

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

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