var timeout         = 500;
	var closetimer		= 0;
	var ddmenuitem      = 0;
	function mopen(id)
	{	
		mcancelclosetime();
		if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
		ddmenuitem = document.getElementById(id);
		ddmenuitem.style.visibility = 'visible';
	}
	function mclose()
	{
		if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	}
	function mclosetime()
	{
		closetimer = window.setTimeout(mclose, timeout);
	}
	function mcancelclosetime()
	{
		if(closetimer)
		{
			window.clearTimeout(closetimer);
			closetimer = null;
		}
	}
	document.onclick = mclose;