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.copyright2_line {
padding: 5px 5px 5px 5px;
width:100%;
position:fixed; _position:absolute;_bottom:expression(eval(document.body.scrollTop));z-index:1024;right:0;bottom:0;
}
<!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>浮动</title>
<style type="text/css">
#postBar {
position:fixed;
left:0px;
bottom:0;
_position:absolute;
_top:expression(document.documentElement.clientHeight + document.documentElement.scrollTop - this.offsetHeight);
}
</style>
</head>
<body>postBar
<div style="height:1000px;"></div>
<div id="postBar"><img src="http://static.kijiji.cn/images/post.gif" alt="广告" /></div>
</body>
</html>
.copyright2_line {
padding: 5px 5px 5px 5px;
width:100%;
position:fixed; _position:absolute;_bottom:expression(eval(document.body.scrollTop));z-index:1024;right:0;bottom:0;
}