var version = "NG";
        browserName = navigator.appName;
        browserVer = parseInt(navigator.appVersion);
        if (browserName == "Netscape" && browserVer >= 3) version = "OK";
        if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "OK";
        if (version == "OK"){
                 menu1_on = new Image();
                   menu1_on.src = "../about2.jpg";
                 menu1_off = new Image();
                   menu1_off.src = "../about.jpg";
                 menu2_on = new Image();
                   menu2_on.src = "../products2.jpg";
                 menu2_off = new Image();
                   menu2_off.src = "../products.jpg";
                 menu3_on = new Image();
                   menu3_on.src = "../services2.jpg";
                 menu3_off = new Image();
                   menu3_off.src = "../services.jpg";
                 menu4_on = new Image();
                   menu4_on.src = "../contact2.jpg";
                 menu4_off = new Image();
                   menu4_off.src = "../contact.jpg";
                 menu5_on = new Image();
                   menu5_on.src = "";
                 menu5_off = new Image();
                   menu5_off.src = "";
              }
         function img_act(imgName){
                if (version == "OK"){
                        imgOn = eval(imgName + "_on.src");
                        document[imgName].src = imgOn;
                }
             }
         function img_inact(imgName){
                if (version == "OK"){
                        imgOff = eval(imgName + "_off.src");
                        document[imgName].src = imgOff;
                }
             }