js简单的弹出框有关闭按钮

<!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=utf-8" />
<title>简易弹出框</title>
<style type="text/css">
.mydiv {
background-color: #ff6;
border: 5px solid #f90;
text-align: center;
line-height: 40px;
font-size: 12px;
font-weight: bold;
z-index:99;
width: 300px;
height: 120px;
left:50%;/*FF IE7*/
top: 50%;/*FF IE7*/

margin-left:-150px!important;/*FF IE7 */
margin-top:-60px!important;/*FF IE7 */

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*/

}

.bg {
background-color: #ccc;
width: 100%;
height: 100%;
left:0;
top:0;/*FF IE7*/
filter:alpha(opacity=10);/*IE*/
opacity:0.8;/*FF*/
z-index:1;
position:fixed!important;/*FF IE7*/
position:absolute;/*IE6*/

}
/*The END*/

</style>
<script type="text/javascript">
function showDiv(){
document.getElementById('popDiv').style.display='block';
document.getElementById('bg').style.display='block';
}

function closeDiv(){
document.getElementById('popDiv').style.display='none';
document.getElementById('bg').style.display='none';
}

</script>

</head>

<body>

巴特西

js简单的弹出框有关闭按钮

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