// Detect if browser is Netscape 3 + or IE 4 +.
   bName = navigator.appName;
   bVer = parseInt(navigator.appVersion);
   if ((bName == "Netscape" && bVer >= 4) ||
       (bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3";
   else br = "n2";

// Create image objects, preload all active and inactive images.
    if (br == "n3")
        {
        // navigation menu items
        // colored bullets
        OnW = new Image();
        OnW.src = "../images/blanc.jpg";

   	OnB = new Image();
        OnB.src = "images/noir_dot.jpg";

        Off = new Image();
        Off.src = "../images/empty.gif";
        }

// Function to "highlight" images.
function highlight(img_name, imag1)
 {
     if (br == "n3")
        {
        if(name==img_name) return;
        document[img_name].src = eval (imag1 + ".src");
        }
 }