function tree2(menu_class,menu_id)
		{
 			var div=document.getElementById(menu_id);
				 if (div.style.display == "block") div.style.display="none";
				 else {
					  var sib=div.parentNode.childNodes;
				  for (var i=0; i < sib.length; i++)
				   if (sib[i].className == menu_class) sib[i].style.display="none";
					  div.style.display="block";
					 }
		}
		function SwapImg(name,url) 
		{
			document.images[name].src=url;
		}