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

// Create image objects, preload all active and inactive images.
    if (br== "n3") { 
    nav01on = new Image();
    nav01on.src = "../../images/L2images/nav01b.jpg";
    nav02on = new Image();
    nav02on.src = "../../images/L2images/nav02b.jpg";
    nav03on = new Image();
    nav03on.src = "../../images/L2images/nav03b.jpg";
    nav04on = new Image();
    nav04on.src = "../../images/L2images/nav04b.jpg";
    nav05on = new Image();          
    nav05on.src = "../../images/L2images/nav05b.jpg";  
    nav06on = new Image();          
    nav06on.src = "../../images/L2images/nav06b.jpg"; 
    nav07on = new Image();
    nav07on.src = "../../images/L2images/nav07b.jpg";
    nav08on = new Image();
    nav08on.src = "../../images/L2images/nav08b.jpg";
    nav09on = new Image();
    nav09on.src = "../../images/L2images/nav09b.jpg";
    nav10on = new Image();
    nav10on.src = "../../images/L2images/nav10b.jpg";
    nav11on = new Image();
    nav11on.src = "../../images/L2images/nav11b.jpg";
    

    nav01off = new Image();
    nav01off.src = "../../images/L2images/nav01a.jpg";
    nav02off = new Image();
    nav02off.src = "../../images/L2images/nav02a.jpg";
    nav03off = new Image();
    nav03off.src = "../../images/L2images/nav03a.jpg";
    nav04off = new Image();
    nav04off.src = "../../images/L2images/nav04a.jpg";
    nav05off = new Image();          
    nav05off.src = "../../images/L2images/nav05a.jpg";  
    nav06off = new Image();          
    nav06off.src = "../../images/L2images/nav06a.jpg"; 
    nav07off = new Image();
    nav07off.src = "../../images/L2images/nav07a.jpg";
    nav08off = new Image();
    nav08off.src = "../../images/L2images/nav08a.jpg";
    nav09off = new Image();
    nav09off.src = "../../images/L2images/nav09a.jpg";
    nav10off = new Image();
    nav10off.src = "../../images/L2images/nav10a.jpg";
    nav11off = new Image();
    nav11off.src = "../../images/L2images/nav11a.jpg";
    
    }

// Function to "activate" images.
function imgAct(imgName) {
    if (br == "n3") {
    document[imgName].src= eval(imgName + "on.src");
    }
}

// Function to "deactivate" images.
function imgInact(imgName) {
    if (br == "n3") {
    document[imgName].src= eval(imgName + "off.src");
    }
}