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<html lang="en-US">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.wrapper{1000px;height:2000px;margin-left:auto;margin-right:auto;}
.header{height:150px;}
#nav{padding:10px;position:relative;top:0;background:black;1000px;}
a{display:inline-block;margin:0 10px;*display:inline;zoom:1;color:white;}
</style>
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<body>
<div class="wrapper">
<div class="header"></div>
<div id="nav">
<a href="#">小皇博客</a>
<a href="#">小皇博客</a>
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<a href="#">小皇博客</a>
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</div>
</div>
</body>
</html>
<script type="text/javascript">
function menuFixed(id){
var obj = document.getElementById(id);
var _getHeight = obj.offsetTop;
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