if (document.images)
   {
     image_off= new Image(400,80);
     image_off.src="/media/thumbs/meet_chimps_banner.gif";  

     image2= new Image(400,80);
     image2.src="/media/thumbs/gazeChimp-bannerB.gif";
     image3= new Image(400,80);
     image3.src="/media/thumbs/cyoa-banner.jpg";
     image4= new Image(400,80);
     image4.src="/media/thumbs/tree-bannerA.jpg";  
     image5= new Image(400,80);
     image5.src="/media/thumbs/behaviors-banner.gif";  
     image6= new Image(400,80);
     image6.src="/media/thumbs/camcorder-banner.jpg"; 
   }

function change1(picName,imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + ".src");
      document[picName].src= imgOn;
    }
 }