<style>
A:link,A:visited ,A:active {TEXT-DECORATION: none}
A:hover {text-decoration : none; position : relative; top : 1px; left : 1px}
</style>

<A HREF="http://www.knowsky.com/">把鼠标放上来看看效果---</A>
<A HREF="http://www.knowsky.com/">这里是网页教学网</A>