function showImg(src, type) {
   large = document.getElementById("proddetailImg");
   if(large) {
       large.src = src;
   }
   link = document.getElementById("imgbacklink");
   if(link) {
       if(type=="main") {
           link.style.visibility = "hidden";
       } else {
           link.style.visibility = "visible";
       }
   }
}