div浮层,滚动条移动,位置保持不变的4种方法汇总(2)

_top:       expression(eval(document.compatMode &&
            document.compatMode=='CSS1Compat') ?
            documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
            document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/

}
-->
</style>
<script language="javascript" type="text/javascript">
function showDiv(){

document.getElementById('popDiv').style.display='block';

}
window.onload=function(){
    showDiv();
}
</script>
<!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>始终在中间DIV (支持IE FF)</title>
</head>
<body>
<div>始终在中间<br/>
</div>
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
</body>
</html>

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