Customize mouse style in web_html/css_WEB-ITnose

最近写项目需要实现一个功能：鼠标移动到一个图片左边显示左箭头，移动到右边显示右箭头。

  .toleft        {            width: 200px;            height: 300px;            position: absolute;            left: 0px;            top: 0px;            cursor: url(../images/test/cursor_left.cur), default;        }        .toright        {            width: 200px;            height: 300px;            position: absolute;            left: 200px;            top: 0px;            cursor: url(../images/test/cursor_right.cur), default;        }