browserName = navigator.appName;
           browserVer = parseInt(navigator.appVersion);
               if ((browserName == "Netscape" && browserVer >= 3)
                  || (browserName == "Microsoft Internet Explorer" && browserVer >= 4) )
              var version = "n3";
               else version="n2";
               
chisiamo_off= new Image;
chisiamo_off.src="images/chisiamo_off.jpg";
chisiamo_on= new Image;
chisiamo_on.src="images/chisiamo_on.jpg";

elixir_off= new Image;
elixir_off.src="images/elixir_off.jpg";
elixir_on= new Image;
elixir_on.src="images/elixir_on.jpg";

contattaci_off= new Image;
contattaci_off.src="images/contattaci_off.jpg";
contattaci_on= new Image;
contattaci_on.src="images/contattaci_on.jpg";

home_off= new Image;
home_off.src="images/home_off.jpg";
home_on= new Image;
home_on.src="images/home_on.jpg";

function img_act(imgName) {
        if (version == "n3") {
        imgOn = eval(imgName + "_on.src");
        document [imgName].src = imgOn;
        }
}
function img_inact(imgName) {
        if (version == "n3") {
        imgOff = eval(imgName + "_off.src");
        document [imgName].src = imgOff;
        }
        }