bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
        if  ((bName == "Netscape" && bVer >= 3) || (bName == "Microsoft Internet Explorer" && bVer >= 4)) ver = "good";
        else ver = "bad";

             if (ver == "good") {
             m1on = new Image();
             m1on.src = "/images/m1_over.jpg";
             m2on = new Image();
             m2on.src = "/images/m2_over.jpg";
             m3on = new Image();
             m3on.src = "/images/m3_over.jpg";
             m4on = new Image();
             m4on.src = "/images/m4_over.jpg";
             m5on = new Image();
             m5on.src = "/images/m5_over.jpg";
            
             m1off = new Image();
             m1off.src = "/images/m1.jpg";
             m2off = new Image();
             m2off.src = "/images/m2.jpg";
             m3off = new Image();
             m3off.src = "/images/m3.jpg";
             m4off = new Image();
             m4off.src = "/images/m4.jpg";
             m5off = new Image();
             m5off.src = "/images/m5.jpg";

             }



     function img_act(imgName) {
             if (ver == "good") {
             imgOn = eval(imgName + "on.src");
             document[imgName].src = imgOn;
             }
     }

     function img_inact(imgName) {
             if (ver == "good") {
             imgOff = eval(imgName + "off.src");
             document[imgName].src = imgOff;
             }
    }