browserName = navigator.appName;
     browserVer = parseInt(navigator.appVersion);
             if ((browserName == "Netscape" && browserVer >= 3) || (browserName == "Microsoft Internet Explorer" && browserVer >= 4)) version = "n3";
             else version = "n2";
             if (version == "n3") {

             bibon = new Image();
             bibon.src = "im/biboff.gif";
             simon = new Image();
             simon.src = "im/b02.en.sima.off.gif";	

             biboff = new Image();
             biboff.src = "im/bibon.gif";
             simoff = new Image();
             simoff.src = "im/b02.en.sima.on.gif";

             bibkon = new Image();
             bibkon.src = "im/biboff.gif";
             simkon = new Image();
             simkon.src = "im/b02.en.sima.off.gif";	

             bibkoff = new Image();
             bibkoff.src = "im/bibon.gif";
             simkoff = new Image();
             simkoff.src = "im/b02.en.sima.on.gif"; 
			 }
     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;
             }
     }