function show_sub(id)
{
  for(i=1;i<=ids.length;i++)
    {
      if(id==ids[i]) continue;
      else
      {
        el=document.getElementById("menu"+ids[i]);
        if(el)
        {
          el.style.visibility="hidden";
          el.style.display="none";
        }
      }
    }
  el=document.getElementById("menu"+id);
  if(el)
  {
    el.style.visibility="visible";
    el.style.display="block";
  }
  return false;
}