browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3)
version = "n3";
else 
version = "n2";        
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4)
version = "n3";                       
if (version == "n3") {
imageIntroon = new Image(0, 0);
imageIntroon.src = "images/nav_intro_on.gif";
imageCreditson = new Image(0, 0);
imageCreditson.src = "images/nav_credits_on.gif";
imageNewson = new Image(0, 0);
imageNewson.src = "images/nav_news_on.gif";
imagePresson = new Image(0, 0);
imagePresson.src = "images/nav_press_on.gif";
imageContacton = new Image(0, 0);
imageContacton.src = "images/nav_contact_on.gif";
          
imageIntrooff = new Image(0, 0);
imageIntrooff.src = "images/nav_intro_off.gif";
imageCreditsoff = new Image(0, 0);
imageCreditsoff.src = "images/nav_credits_off.gif";
imageNewsoff = new Image(0, 0);
imageNewsoff.src = "images/nav_news_off.gif";
imagePressoff = new Image(0, 0);
imagePressoff.src = "images/nav_press_off.gif";
imageContactoff = new Image(0, 0);
imageContactoff.src = "images/nav_contact_off.gif";
}
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;
}
}