// Copyright 2006-2007 javascript-array.com

		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
			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;