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")
   {
     HomeOn= new Image(300,35);
     HomeOn.src="images/ButtonOn.gif";
          
     HomeOff= new Image(300,35);
     HomeOff.src="images/ButtonOff.gif";
   }

function lightup(imgName)
 {
   if (version=="n3")
    {
      imgOn=eval(imgName + "On.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (version=="n3")
    {
      imgOff=eval(imgName + "Off.src");
      document[imgName].src= imgOff;
    }
 }