function changeClassType(obj)
		{
			
			for(var i=0;i<document.getElementById("ul_menu").childNodes.length;i++)
			{	
				var objp = document.getElementById("ul_menu").childNodes[i];
				if(objp.nodeName=='#text'){
					continue;
				}else{
				    //alert(objp.nodeType);
					objp.setAttribute("className","n2");
					objp.setAttribute("class","n2");
				}								
			}
			obj.setAttribute("className","n1");
			obj.setAttribute("class","n1");
		}