// 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; 	  
			  //done
			  // -->