var timeout	=100;
	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;