弹出层始终出现在屏幕中间

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

<style>

.joinclub {

width: 440px;

height: 282px;

border: 1px solid #6E665A;

border-radius: 5px;

background: #fff;

padding-top: 10px;

position: absolute;

z-index: 99999999;

display: none;

left: 50%;/*FF IE7*/

top: 50%;/*FF IE7*/

margin-left: -220px!important;/*FF IE7 该值为本身宽的一半 */

margin-top: -140px!important;/*FF IE7 该值为本身高的一半*/

margin-top: 0px;

position: fixed!important;/*FF IE7*/

position: absolute;/*IE6*/

_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*/

}

.bg123 {

background-color: #ccc;

width: 100%;

height: 100%;

z-index: 99999998;

left: 0;

top: 0;/*FF IE7*/

filter: alpha(opacity=50);/*IE*/

opacity: 0.5;/*FF*/

position: fixed!important;/*FF IE7*/

position: absolute;/*IE6*/

_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>

</head>

<body>

<div style="width:100%; height:500px; border:1px solid red"></div>

<a href="#" onclick="join_club()">点击我</a>

</body>

<div class="joinclub" id="joinclub" style="display:none">我是弹出菜单<input type="button" value="关闭我" onclick="closeCustomer()" /></div>

<div id="bg123" class="bg123" style="display:none;"></div>

<script type="text/javascript">

function closeCustomer(){

document.getElementById("joinclub").style.display=’none’;

document.getElementById("bg123").style.display=’none’;

}

function join_club()

{

document.getElementById(‘joinclub’).style.display = ‘block’;

document.getElementById(‘bg123’).style.display = ‘block’;

}

</script>

</html>

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弹出层始终出现在屏幕中间

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