<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style type="text/css">
* { margin:0; padding:0; font-size:14px }
body { text-align:center;}
#btn { list-style:none inside; width:210px; margin:10px auto; clear:both; }
#btn li { float:left; width:100px; line-height:20px }
#btn li a{ display:block; text-decoration:none; color:#333333}
#gray { background:#f5f5f5; cursor: pointer }
#green { background:#D7ECDE; cursor:pointer }
table { border-collapse:collapse; width:70%; margin:10px auto }
td { line-height:100%; height:24px; line-height:24px; padding:0 4px }
td a { text-decoration:none; color:#333; display:block; }
#tab_gray td { border:1px solid #B9B9B9; background: #F2F2F2; }
#tab_green td { border:1px solid #95CCA7; background:#EBF5EE; }
#tab_gray td:hover, #tab_green td:hover { background:#fff; }
</style>
</head>
<body>
<ul id="btn">
<li id="gray"><a href="javascript:void()" onclick="gray()">gray</a></li>
<li id="green"><a href="javascript:void()" onclick="green()">green</a></li>
</ul>
<table id="tab_gray">
<tr>
<td><a href="#">Table</a></td>
<td><a href="#">Table</a></td>
<td><a href="#">Table</a></td>
</tr>
<tr>
<td>hello</td>
<td>hello</td>
<td>hello</td>
</tr>
<tr>
<td>hello</td>
<td>hello</td>
<td>hello</td>
</tr>
</table>
<script language="javascript">
function green(){
document.getElementById("tab_gray").id="tab_green";
}
function gray(){
document.getElementById("tab_green").id="tab_gray";
}
</script>
</body>
</html>