<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<script type="text/javascript" src="js/prefixfree.min.js"></script>
<title>用css3实现鼠标移进去当前亮其他变灰</title>
</head>
<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;
-webkit-transition: opacity 1s ease-in-out;
-moz-transition: opacity 1s ease-in-out;
-ms-transition: opacity 1s ease-in-out;
-o-transition: opacity 1s ease-in-out;
transition: opacity 1s ease-in-out;
}
.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;
-webkit-transition: opacity 1s ease-in-out;
-moz-transition: opacity 1s ease-in-out;
-ms-transition: opacity 1s ease-in-out;
-o-transition: opacity 1s ease-in-out;
transition: opacity 1s ease-in-out;
}
.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"); }
.linkedin { background-image:url("http://images.cnblogs.com/cnblogs_com/hxh-hua/478335/o_flickr.png"); }
.box a{display: block;}
</style>
<body>
<div class="wrapper">
<ul class="box">
<li class="delicious"><a href="#" >Delicious</a></li>
<li class="digg"><a href="#" >Digg</a></li>
<li class="facebook"><a href="#" >Facebook</a></li>
<li class="flickr"><a href="#">Flickr</a></li>
<li class="linkedin"><a href="#">LinkedIn</a></li>
</ul>
</div>
</body>
</html>
demo:http://jsfiddle.net/9SuUy/