function ShowHide(id1, id2)
{
 if (id1 != '') expMenu(id1);
 if (id2 != '') expMenu(id2);
}

function expMenu(id)
{
 var itm = null;
 if (document.getElementById) { itm = document.getElementById(id); }
 else if (document.all) { itm = document.all[id]; }
 else if (document.layers) { itm = document.layers[id]; }

 if (!itm) {}
 else
 if (itm.style)
 {
  if (itm.style.display == "none") { itm.style.display = ""; }
  else { itm.style.display = "none"; }
 }
 else { itm.visibility = "show"; }
}