if (document.images)
   {
     pic1on= new Image(134,19);
     pic1on.src="http://www.theforceonline.com/product2/images/force/lawbut2.jpg";  

     pic1off= new Image(134,19);
     pic1off.src="http://www.theforceonline.com/product2/images/force/lawbut1.jpg";
     
     pic2on= new Image(149,19);
          pic2on.src="http://www.theforceonline.com/product2/images/force/specbut2.jpg";  
     
          pic2off= new Image(149,19);
     pic2off.src="http://www.theforceonline.com/product2/images/force/specbut1.jpg";
     
     pic3on= new Image(136,19);
          pic3on.src="http://www.theforceonline.com/product2/images/force/landbut2.jpg";  
     
          pic3off= new Image(136,19);
     pic3off.src="http://www.theforceonline.com/product2/images/force/landbut1.jpg";
     
     pic4on= new Image(136,19);
               pic4on.src="http://www.theforceonline.com/product2/images/force/firstbut2.jpg";  
          
               pic4off= new Image(136,19);
     pic4off.src="http://www.theforceonline.com/product2/images/force/firstbut1.jpg";
   }

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
      
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }