function submenu(n,k)
{
   var sm =document.getElementById(n).style;
   if (sm.display !== "none") 
     {
	 sm.display = "none";
	 document.images[k].src = "../../image/expanded.gif";
	 }
   else 
     {
	 sm.display = ""; 
 	 document.images[k].src = "../../image/collapsed.gif";
	 	 }
}