function show(layer_ref) {

   var state = '';
   if (document.all) { //IS IE 4 or 5 (or 6 beta)
   eval( "document.all." + layer_ref + ".style.display = state");
   }
   if (document.layers) { //IS NETSCAPE 4 or below
      document.layers[layer_ref].display = state;
   }
   if (document.getElementById &&!document.all) {
      hza = document.getElementById(layer_ref);
      hza.style.display = state;
   }
}

function hide(layer_ref) {

   var state = 'none';
   if (document.all) { //IS IE 4 or 5 (or 6 beta)
   eval( "document.all." + layer_ref + ".style.display = state");
   }
   if (document.layers) { //IS NETSCAPE 4 or below
      document.layers[layer_ref].display = state;
   }
   if (document.getElementById &&!document.all) {
      hza = document.getElementById(layer_ref);
      hza.style.display = state;
   }
}