function ShowHide(layer_open, layer_close) { 
      if (layer_open != '') { 
         expandLayer(layer_open); 
      } 
      if (layer_close != '') { 
         expandLayer(layer_close); 
      } 
   } 

   function expandLayer(name) { 
      var itm = null; 

      if (document.getElementById) { 
         itm = document.getElementById(name); 
      } else if (document.all) { 
         itm = document.all[name]; 
      } else if (document.layers) { 
         itm = document.layers[name]; 
      } 

      if (!itm) { 
      // Just don't panik, it's ok 
      } else if (itm.style) { 
         if (itm.style.display == "none") { 
            itm.style.display = ""; 
         } else { 
            itm.style.display = "none"; 
         } 
      } else { 
         itm.visibility = "show"; 
      } 
   }