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") {

	knapp1on = new Image(0,0);
	knapp1on.src = "images/menua1.gif";
	knapp1off = new Image(0,0);
	knapp1off.src = "images/menua0.gif";

	knapp2on = new Image(0,0);
	knapp2on.src = "images/menub1.gif";
	knapp2off = new Image(0,0);
	knapp2off.src = "images/menub0.gif";

	knapp3on = new Image(0,0);
	knapp3on.src = "images/menuc1.gif";
	knapp3off = new Image(0,0);
	knapp3off.src = "images/menuc0.gif";

	knapp4on = new Image(0,0);
	knapp4on.src = "images/menud1.gif";
	knapp4off = new Image(0,0);
	knapp4off.src = "images/menud0.gif";
    
	knapp5on = new Image(0,0);
	knapp5on.src = "images/menue1.gif";
	knapp5off = new Image(0,0);
	knapp5off.src = "images/menue0.gif";
    
    knapp6on = new Image(0,0);
	knapp6on.src = "images/menuf1.gif";
	knapp6off = new Image(0,0);
	knapp6off.src = "images/menuf0.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;
   }
}