code: function initComparator() {
      by = 'rating'; // Default to sort by rating.
      // If the sortBy cookie is set, use that instead.
      if (document.cookie.length > 0) {
        var start = document.cookie.indexOf('sortBy=');
        if (start != -1) {
          start = start + 7;
          var end = document.cookie.indexOf(";", start);
          if (end == -1) {
            end = document.cookie.length;
            by = unescape(document.cookie.substring(start, end));
          }
        }
      }
      setComparator();
    }
docs: Create a comp function. If the user has preferences stored in
  the sortBy cookie, use those, otherwise use the default.