if (document.images)
   {
     pic2on= new Image;
     pic2on.src="images/domestic-copper.jpg";
     pic2off= new Image;
     pic2off.src="images/spacer2.jpg";
     pic3on= new Image;
     pic3on.src="images/clean-wire.jpg";
     pic3off= new Image;
     pic3off.src="images/spacer2.jpg";
     pic4on= new Image;
     pic4on.src= "images/clean-copper.jpg";
     pic4off= new Image;
     pic4off.src= "images/spacer2.jpg";
     pic5on= new Image;
     pic5on.src= "images/insulated-copper.jpg";
     pic5off= new Image;
     pic5off.src= "images/spacer2.jpg";
     pic6on= new Image;
     pic6on.src= "images/motors.jpg";
     pic6off= new Image;
     pic6off.src= "images/spacer2.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;
    }
 }