// Copyright 2006-2007 javascript-array.com
     
     var timeout	= 50;
     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;