// Cache Images
var imgcache = {};
function cacheImg() {
   var im = false, args = cacheImg.arguments;
   for (var i=0; i<args.length; i++) {
     im = args[i];
     imgcache[im] = new Image();
     imgcache[im].src = im;
     /*imgcache[im].style.display = 'none';
     document.body.appendChild(imgcache[im]);*/ }
}

// Image Gallery
function changeImg(src) {
   var targ = document.getElementById('prod_img');
   if (targ.src) var chk = targ.src.substr(-src.length,src.length);
   if (chk && chk != src) targ.src = src;
}