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") {
imageHomeon = new Image(0, 0);
imageHomeon.src = "images/nav/nav_home_on.gif";
imageAbouton = new Image(0, 0);
imageAbouton.src = "images/nav/nav_about_on.gif";
imageFaqon = new Image(0, 0);
imageFaqon.src = "images/nav/nav_faq_on.gif";
imageFeedbackon = new Image(0, 0);
imageFeedbackon.src = "images/nav/nav_feedback_on.gif";
imageLinkson = new Image(0, 0);
imageLinkson.src = "images/nav/nav_links_on.gif";
          
imageHomeoff = new Image(0, 0);
imageHomeoff.src = "images/nav/nav_home_off.gif";
imageAboutoff = new Image(0, 0);
imageAboutoff.src = "images/nav/nav_about_off.gif";
imageFaqoff = new Image(0, 0);
imageFaqoff.src = "images/nav/nav_faq_off.gif";
imageFeedbackoff = new Image(0, 0);
imageFeedbackoff.src = "images/nav/nav_feedback_off.gif";
imageLinksoff = new Image(0, 0);
imageLinksoff.src = "images/nav/nav_links_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;
}
}