var ns4 = (document.layers);
  var ie4 = (document.all && !document.getElementById);
  var ie5 = (document.all && document.getElementById);
  var ns6 = (!document.all && document.getElementById);

  function show(id) {
   if(ns4){document.mSubNada.layers[id].visibility = "hide";}
   else if(ie4){document.all[id].style.visibility = "visible";}
   else if(ie5 || ns6){document.getElementById(id).style.visibility = "visible";}
  }

  function hide(id) {
   if(ns4){document.mSubNada.layers[id].visibility = "hide";}
   else if(ie4){document.all[id].style.visibility = "hidden";}
   else if(ie5 || ns6){document.getElementById(id).style.visibility = "hidden";}
  }