<!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>
<title>底部浮动js</title>
</head>
<style>
#wgcss_dingwei { background-position: top center; position: absolute; width:1040px;height:94px; z-index: 10000;}
#wgcss_k { width:1040px; z-index: 8999;height:94px; overflow:hidden;}
</style>
<body>
<div ;
bottompiaofu.style.top=(document.documentElement.scrollTop+document.documentElement.clientHeight-bottompiaofu.offsetHeight)+'px'
setTimeout(piaofu_div,100);
}
piaofu_div();
</script>
来自博客园：笑小http://www.cnblogs.com/jjklmm/archive/2012/07/18/2596722.html