function doClick(mm){
	 mm.className="list";
	 var j;
	 var id;
	 var e;
	 for(var i=1;i<=11;i++){
	   id ="nav"+i;
	   j = document.getElementById(id);
	   e = document.getElementById("sub"+i);
	   if(id != mm.id)
	   {
	   	 j.className="list1";
	   	 e.style.display = "none";
	   }
	   else
	   {
			e.style.display = "block";
	   }
	 }
}