// Copyright 2006-2007 javascript-array.com
			var timeout	= 100;
			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
			ddmenuitem = document.getElementById(id);
			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;