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以下是代码片段：
<!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>主页面</title>
<style type="text/css">
html, body {
margin: 0;
padding: 0;
}
body {
}
#div1 {
height: 2000px;
}
#floatedLayer {
position: fixed;
_position: absolute;
}
</style>
</head>
<body>
<div id="floatedLayer">
<iframe src="demo.html" width="580" height="542" frameborder="no"></iframe>
</div>
<div id="div1"></div>
<script type="text/javascript">
var floatedLayer = document.getElementById("floatedLayer");
function adjustPopupWin() {
var height = document.documentElement.clientHeight,
width = document.documentElement.clientWidth;
floatedLayer.style.left = Math.max((width - floatedLayer.offsetWidth) / 2, 0) + "px";
floatedLayer.style.top = Math.max((height - floatedLayer.offsetHeight) / 2, 0) + "px";
}
</script>
<!--[if IE 6]>
<script type="text/javascript">
function adjustPopupWin() {
var height = document.documentElement.clientHeight,
width = document.documentElement.clientWidth;
floatedLayer.style.left = Math.max((width - floatedLayer.offsetWidth) / 2, 0) + document.documentElement.scrollLeft + "px";
floatedLayer.style.top = Math.max((height - floatedLayer.offsetHeight) / 2, 0) + document.documentElement.scrollTop + "px";
}
window.onscroll = adjustPopupWin;
</script>
<![endif]-->
<script type="text/javascript">
window.onresize = adjustPopupWin;
adjustPopupWin();
</script>
</body>
</html>
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