this.getScrollTop = function (last) {
        if (!last) {
          var mtx = getMatrixValues();
          if (mtx) return (mtx.length == 16) ? -mtx[13] : -mtx[5]; //matrix3d 16 on IE10
          if (self.timerscroll && self.timerscroll.bz) return self.timerscroll.bz.getNow();