function changebg(id)
     {
     document.getElementById(id).className="product_bg2";
     }
     
     function showorig(id)
     {
     document.getElementById(id).className="product_bg";
     }
     
       function effectbg(id)
     {
     document.getElementById(id).className="effectbg";
     }
     
     function effectorig(id)
     {
     document.getElementById(id).className="effecthover";
     }