有个css导航背景的问题

    <div id="menu">
        <ul id="menuList">
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
            <li class="nor"><a href="/dhnews/zt/sjwm/" target="_blank">&nbsp;&nbsp;&nbsp;&nbsp;</a></li>
        </ul>
        <img src="images/menu_03.png" />
    </div>

黑色背景是加在menu样式里的，专题首页这些字是图片menu_03.png，鼠标移过如果背景变红呢

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字也是图片，hover的时候把字的图片替换成红底的字图片就好了。