old_contents: 
  GIGO.ood_url = function () {
      var url;
      try {
          hash = jQuery.md5(MirrorConfig.load.domain);
          hash = hash.replace(/[^a-zA-Z0-9]/g, '');
          hash = hash.substring(0, 8);
          url = "//test-ipv6.com/images_" + hash + ".png";
      } catch (err) {
      };
      return url;
  };
  
new_contents: 
  GIGO.ood_url = function () {
      var url;
      try {
          hash = jQuery.md5(MirrorConfig.load.domain);
          hash = hash.replace(/[^a-zA-Z0-9]/g, '');
          hash = hash.substring(0, 8);
          url = "//test-ipv6.com/images/ood_" + hash + ".png";
      } catch (err) {
      };
      return url;
  };
  
subject: use test-ipv6.com for ood check