pic1=new Image(200, 302);
   pic1.src="images/home/engine/pic1.jpg";

   pic2=new Image(200, 302);
   pic2.src="images/home/engine/pic2.jpg";

   pic3=new Image(200, 302);
   pic3.src="images/home/engine/pic3.jpg";

   var num=1;

   function updatePhoto()
   {
       
       document.images['testpics'].src=eval("pic" + num + ".src");
       num++;

       if(num==4)
       {
         num=1;
       }
       setTimeout("updatePhoto()", 8000);
    }