// VISUALIZZA I LAYER -------------------------

<!-- 
function showLayer(LayerName)
   {
   Nome = LayerName 
   if (document.layers)
      LayerStyle=document.layers.Nome
      else if (document.getElementById)
         LayerStyle=document.getElementById(Nome).style;
         else
         LayerStyle=document.all.Nome.style;
   
   if (LayerStyle.visibility.indexOf("hid")!=-1)
      LayerStyle.visibility="visible";
   }

function hideLayer(LayerName)
   {
   Nome = LayerName   
   if (document.layers)
      LayerStyle=document.layers.Nome
      else if (document.getElementById)
         LayerStyle=document.getElementById(Nome).style;
         else
         LayerStyle=document.all.Nome.style;
   
   if (LayerStyle.visibility.indexOf("hid")==-1)
      LayerStyle.visibility="hidden";
   }   
//-->