code: function (id, fn) {
              id = (id + EMPTY).match(RE_ID_STR)[1];
              var retryCount = 1;
              var timer = util.later(function () {
                      if (++retryCount > POLL_RETIRES) {
                          timer.cancel();
                          return;
                      }
                      var node = doc.getElementById(id);
                      if (node) {
                          fn(node);
                          timer.cancel();
                      }
                  }, POLL_INTERVAL, true);
          }
docs: Executes the supplied callback when the item with the supplied id is found.
  @param id {String} The id of the element, or an array of ids to look for.
  @param fn {Function} What to execute when the element is found.
  @member KISSY