ActiveButton = "";  
  browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 3 )))
  if ( browser )  {
  
     close_0      = new Image(18, 14);
     close_0.src  = "images/bottoni/home.gif";
     open_0       = new Image(18, 14);
     open_0.src   = "images/bottoni/home1.gif";
     
     close_1      = new Image(18, 14);
     close_1.src  = "images/bottoni/aboutas.gif";
     open_1      = new Image(18, 14);
     open_1.src   = "images/bottoni/aboutas1.gif";

     close_2      = new Image(18, 14);
     close_2.src  = "images/bottoni/service.gif";
     open_2       = new Image(18, 14);
     open_2.src   = "images/bottoni/service1.gif";
     
     close_3      = new Image(18, 14);
     close_3.src  = "images/bottoni/contact.gif";
     open_3       = new Image(18, 14);
     open_3.src   = "images/bottoni/contact1.gif";

     
     
  }
  function change(Name, Num,nu) 
{
     for (i=0; i<Num; i++)
             {
                  document  ['close_' + i].src = eval("close_"+i+".src");
              }
     document  [Name].src = eval("open_"+(nu)+".src");
  }