<style>
.test{position:relative;color:#0000cc;text-decoration:none;font-size:12px;}
.test:hover{background:none;}
.test span {display: none;}
.test:hover span{display:block;position:absolute;top:20px;left:8px;border-bottom:2px solid #eee;border-right:2px solid #eee;}
.test:hover span p{border:1px solid #ccc;background:#fff;color:#000;padding:5px;text-align:left;font-size:12px;}
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<a class="test" href="#">链接一<span><p>动态网站制作指南_www.iocblog.net</p></span></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a class="test" href="#">链接二<span><p>动态网站制作指南_www.knowsky.com</p></span></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a class="test" href="#">链接三<span><p>动态网站制作指南_www.iocblog.net</p></span></a>[来源 www.iocblog.net]

保存为htm浏览。