bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
    if ((bName == "Netscape" && bVer >= 3) || 
        (bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3"; 
    else br = "n2";

    if (br== "n3") { 

        
    img1on = new Image();                    
    img1on.src = "images/nav01on.gif";      
    img1off = new Image();              
    img1off.src = "images/nav01.gif";
    
    img2on = new Image();                    
    img2on.src = "images/nav02on.gif";      
    img2off = new Image();              
    img2off.src = "images/nav02.gif";
    
    img3on = new Image();                    
    img3on.src = "images/nav03on.gif";      
    img3off = new Image();              
    img3off.src = "images/nav03.gif";
    
    img4on = new Image();                    
    img4on.src = "images/nav04on.gif";      
    img4off = new Image();              
    img4off.src = "images/nav04.gif";

    img5on = new Image();                    
    img5on.src = "images/nav05on.gif";      
    img5off = new Image();              
    img5off.src = "images/nav05.gif";
    
    
    img51on = new Image();                    
    img51on.src = "images/nav0501on.gif";      
    img51off = new Image();              
    img51off.src = "images/nav0501.gif";
    
    img53on = new Image();                    
    img53on.src = "images/nav050101on.gif";      
    img53off = new Image();              
    img53off.src = "images/nav050101.gif";
    
    
    img52on = new Image();                    
    img52on.src = "images/nav0502on.gif";      
    img52off = new Image();              
    img52off.src = "images/nav0502.gif";
    
    img6on = new Image();                    
    img6on.src = "images/nav06on.gif";      
    img6off = new Image();              
    img6off.src = "images/nav06.gif";
    
    img7on = new Image();                    
    img7on.src = "images/enteron.gif";      
    img7off = new Image();              
    img7off.src = "images/enter.gif";

    
    }
// 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");
    }
}