CSS样式
<!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" />
<title>DIV垂直居中</title>
<style type="text/css">
<!--
.cr { top:50%; left:50%; margin:-80px 0 0 -140px; width:280px; height:160px; position:absolute; background-color:#CCC }
-->
</style>
</head>
<body>
<div class="cr">测试一下是不是垂直居中了;记得加上position:absolute;</div>
</body>
</html>
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