if (document.images)
   {
     pic1on= new Image(150,150);
     pic1on.src="images/box_foodfudge.jpg";  
     pic2on= new Image(728,509);
     pic2on.src="images/bg-page-products-foodchoc.jpg";

     pic1off= new Image(150,150);
     pic1off.src="images/box_foodchoc.jpg";
     pic2off= new Image(728,509);
     pic2off.src="images/bg-page-products-foodfudge.jpg";
   }

function lightup(imgName,imgName2)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
      imgOn2=eval(imgName2 + "on.src");
      document[imgName2].src= imgOn2;
    }
 }

function turnoff(imgName,imgName2)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
      imgOff2=eval(imgName2 + "off.src");
      document[imgName2].src= imgOff2;
    }
 }