function clickHandler()
  {
  var targetId, srcElement, targetElement;
  srcElement = window.event.srcElement;
  if (srcElement.className == "menu")
    {
     targetId = srcElement.id + "x";
     targetElement = document.all(targetId);
     if (targetElement!=null)
       {
       if (targetElement.style.display == "none")
         {
          targetElement.style.display = "";
         }
       else
         {
          targetElement.style.display = "none";
         }
       }
    }
  }