javascript - 视差开合照片

Question

我在一个使用视差的网站上工作——我有一张照片，我垂直切成两半，当你向下滚动时，它会分开。换句话说，在您滚动之前，没有迹象表明照片会“打开”。这是我的代码：

    $("#section5_back5").stop().animate({ right : (520 * object_speed * 1.8) + (scroll_position * object_speed)}, delay);
    $("#section5_back5").stop().animate({ top : (-50 * object_speed2) + (scroll_position * object_speed2)}, delay);
    $("#section5_back6").stop().animate({ left : (545 * object_speed * 1.8) + (scroll_position * object_speed)}, delay);
    $("#section5_back6").stop().animate({ top : (-50 * object_speed2) + (scroll_position * object_speed2)}, delay);
}

到达照片底部后，有没有办法将照片“关闭”大约 100 像素？