function hideDiv(dd) 
{
   if (document.getElementById) 
   { // DOM3 = IE5, NS6
      var mydiv = document.getElementById(dd);
      mydiv.style.display = 'none';
   }
   else 
   {
      if (document.layers) 
      { // Netscape 4
         document.dd.display = 'none';
      }
      else 
      { // IE 4
         document.all.dd.style.display = 'none';
      }
   }
}

function showDiv(dd) 
{
   if (document.getElementById) 
   { // DOM3 = IE5, NS6
    var mydiv = document.getElementById(dd);
      mydiv.style.display = 'block';
   }
   else 
   {
      if (document.layers) 
      { // Netscape 4
         document.dd.display = 'block';
      }
      else 
      { // IE 4
         document.all.dd.style.display = 'block';
      }
   }
} 

function firstDiv()
{
   hideDiv('premi'); 
   hideDiv('repertorio');
   showDiv('storia');
}


function secondDiv()
{
   hideDiv('storia'); 
   hideDiv('repertorio');
   showDiv('premi');
}

function thirdDiv()
{
   hideDiv('premi'); 
   hideDiv('storia');
   showDiv('repertorio');
}


function SetClass(element,myclass) 
{
   if (document.getElementById) 
   { // DOM3 = IE5, NS6
      var mydiv = document.getElementById(element);
      mydiv.className = myclass;
   }
   else 
   {
      if (document.layers) 
      { // Netscape 4
         document.element.className = myclass;
      }
      else 
      { // IE 4
         document.all.element.className = myclass;
      }
   }
}

function ViewTabs(div1,div2,tab1,tab2,myclass)
{
   hideDiv(div2); 
   SetClass(tab2,myclass);
   showDiv(div1); 
   SetClass(tab1,'');
}