docs: function (obj) {
              var inst = this._getInst(obj);
              var isRTL = this._get(inst, 'isRTL');
              while (obj && (obj.type == 'hidden' || obj.nodeType != 1)) {
                  obj = obj[isRTL ? 'previousSibling' : 'nextSibling'];
              }
              var position = $(obj).offset();
              return [position.left, position.top];
          }