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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" c />
<title>实现hover悬停 链接文字产生阴影</title>
<style type="text/css">
<!--
ul,li{ margin:0px; padding:0px; list-style-type: none;}
#nav{font-family: "宋体";}
#nav li{ float:left; margin-left:30px;}
#nav span{display:none;}
#nav a{font-size:12px; font-weight:800; color:#c00; text-decoration:none; display:block;}
#nav a:hover{ color:#999;top:1px; left:1px; position:relative;}
#nav a:hover span{ display:block; top:-1px; left:-2px; position:absolute; color:#000; cursor:pointer;}
-->
</style>
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<body>
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<ul>
<li><a href="http://www.52css.com/">52CSS HomePage<span>52CSS HomePage</span></a></li>
<li><a href="http://www.52css.com/">Div+CSS教程<span>Div+CSS教程</span></a></li>
<li><a href="http://www.52css.com/">CSS布局实例<span>CSS布局实例</span></a></li>
<li><a href="http://www.52css.com/">CSS2.0教程<span>CSS2.0教程</span></a></li>
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不建议使用滤镜效果（IE专用）。
再就是大家看看这个网站http://www.pplive.com/
它的导航则利用图片实现的阴影效果