function showLayer(nomeLayer) { 
 

// IE + VERSIONI DI NETSCAPE PIU' ODIERNE (6,7 ...)
if (document.getElementById) {
  x = document.body.clientWidth; 

if (nomeLayer=="menu01"){ xf=540; xm=-70;}


 if (x <= 900){document.getElementById(nomeLayer).style.left = xf;}
else {posizionex = (x/2);
 
      document.getElementById(nomeLayer).style.left = posizionex - xm;}
 
  document.getElementById(nomeLayer).style.visibility = 'visible';
  }


// VERSIONI DATATE DI NETSCAPE (4,4.5 ....)

if (document.layers) {


  x = self.innerWidth;
if (nomeLayer=="menu01"){ xf=575; xm=-120;}

  
 if (x <= 900){document.layers[nomeLayer].left = xf;}
 else {posizionex = (x/2);
       document.layers[nomeLayer].left  = (posizionex - xm);
	  }
 document.layers[nomeLayer].visibility = 'visible';
}
 
}
// FINE CODICE NETSCAPE 
 
 
 
 
function hideLayer(nomeLayer) { 
if (document.all) { 
 document.all[nomeLayer].style.visibility = 'hidden'; 
} 
else if (document.getElementById) { 
 document.getElementById(nomeLayer).style.visibility = 'hidden'; 
} 
else if (document.layers) { 
 document.layers[nomeLayer].visibility = "hidden"; 
} 
}