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")
   {
     pic1on= new Image(100,20);
     pic1on.src="images/home2.gif";  
     pic1off= new Image(100,20);
     pic1off.src="images/home1.gif";
     pic2on= new Image(100,40);
     pic2on.src="images/twin2.gif";  
     pic2off= new Image(100,40);
     pic2off.src="images/twin1.gif";
     pic3on= new Image(100,40);
     pic3on.src="images/map2.gif";  
     pic3off= new Image(100,40);
     pic3off.src="images/map1.gif";
     pic4on= new Image(100,40);
     pic4on.src="images/club2.gif";  
     pic4off= new Image(100,40);
     pic4off.src="images/club1.gif";
     pic5on= new Image(100,20);
     pic5on.src="images/school2.gif";  
     pic5off= new Image(100,20);
     pic5off.src="images/school1.gif";
     pic6on= new Image(100,20);
     pic6on.src="images/busin2.gif";  
     pic6off= new Image(100,20);
     pic6off.src="images/busin1.gif";
     pic7on= new Image(100,40);
     pic7on.src="images/find2.gif";  
     pic7off= new Image(100,40);
     pic7off.src="images/find1.gif";
     pic8on= new Image(100,20);
     pic8on.src="images/cont2.gif";  
     pic8off= new Image(100,20);
     pic8off.src="images/cont1.gif";
     pic9on= new Image(100,20);
     pic9on.src="images/what2.gif";  
     pic9off= new Image(100,20);
     pic9off.src="images/what1.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;
   }
 }