<!--
browserName = navigator.appName;
version = "";
     browserVer = parseInt(navigator.appVersion);
             if (browserName == "Netscape" && browserVer >= 3) version = "n3";
             if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "n3";


             if (version == "n3")
             {
       a_on = new Image();
             a_on.src = "buttons/btn1b.png";
                                a_off = new Image();
             a_off.src = "buttons/btn1a.png";
       b_on = new Image();
             b_on.src = "buttons/btn2b.png";
                                b_off = new Image();
             b_off.src = "buttons/btn2a.png";
       c_on = new Image();
             c_on.src = "buttons/btn3b.png";
                                c_off = new Image();
             c_off.src = "buttons/btn3a.png";
       d_on = new Image();
             d_on.src = "buttons/btn4b.png";
                                d_off = new Image();
             d_off.src = "buttons/btn4a.png";
       e_on = new Image();
             e_on.src = "buttons/btn5b.png";
                                e_off = new Image();
             e_off.src = "buttons/btn5a.png";
       f_on = new Image();
             f_on.src = "buttons/btn6b.png";
                                f_off = new Image();
             f_off.src = "buttons/btn6a.png";
       g_on = new Image();
             g_on.src = "buttons/btn7b.png";
                                g_off = new Image();
             g_off.src = "buttons/btn7a.png";
       h_on = new Image();
             h_on.src = "buttons/btn8b.png";
                                h_off = new Image();
             h_off.src = "buttons/btn8a.png";
             }

     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;
             }
     }
//-->