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<title>用css3实现鼠标移进去当前亮其他变灰</title>
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<style type="text/css">
*{margin: 0;padding: 0;font-size:12px;}
.wrapper{border: 1px #708090 solid;width: 900px;margin: 100px auto;height: 300px;padding: 20px;border-radius: 8px;box-shadow: 2px 2px 6px #666,-2px -2px 6px #666;}
li{list-style: none;}
.box:hover li{opacity:0.2; }
.box li{float: left;width:48px; height:48px;position:relative; margin-right:10px;
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.box li:hover{opacity:1; }
.box li a{position:absolute;left:-10px;width:80px;height:30px;top:-30px;color: #fff;font-weight:bold;background:#000;border-radius:8px;box-shadow:1px 0 2px #fff inset;text-align:center;opacity:0;
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.box li:hover a{opacity:1; top:-30px;}
.delicious { background-image:url("http://images.cnblogs.com/cnblogs_com/hxh-hua/478335/o_delicious.png"); }
.digg { background-image:url("http://images.cnblogs.com/cnblogs_com/hxh-hua/478335/o_digg.png"); }
.facebook { background-image:url("http://images.cnblogs.com/cnblogs_com/hxh-hua/478335/o_facebook.png"); }
.flickr { background-image:url("http://images.cnblogs.com/cnblogs_com/hxh-hua/478335/o_digg.png"); }
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.box a{display: block;}
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<ul>
<li><a href="#" >Delicious</a></li>
<li><a href="#" >Digg</a></li>
<li><a href="#" >Facebook</a></li>
<li><a href="#">Flickr</a></li>
<li><a href="#">LinkedIn</a></li>
</ul>
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