// Copyright 2006-2007 javascript-array.com
	
	var timeout	= 500;
	var closetimer	= 0;
	var ddmenuitem	= 0;
	
	// open hidden layer
	function showMenu(id)
	{	
		// cancel close timer
		cancelMenuTimer();
	
		// 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 hideMenu()
	{
		if (ddmenuitem)
		{
			ddmenuitem.style.visibility = 'hidden';
		}
	}
	
	// go close timer
	function hideMenuTimer()
	{
		closetimer = window.setTimeout(hideMenu, timeout);
	}
	
	// cancel close timer
	function cancelMenuTimer()
	{
		if(closetimer)
		{
			window.clearTimeout(closetimer);
			closetimer = null;
		}
	}
	
	// close layer when click-out
	//document.onclick = hideMenu;