层固定在右下角

<!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>IE6 position:fixed</title>
<style type="text/css">
* { margin:0; padding:0;}
#content{ height:2000px; }
#a{ position:fixed; bottom:0; right:0; width:200px; height:60px; background:#F00;}
/*IE6 fixed bug*/
* html{overflow:hidden;}
* html body{height:100%;overflow:auto;}
* html #a{position:absolute;right:18px;}
</style>
</head>
<body>
<div id="content">
IE6 position:fixed
</div>
<div id="a">IE6 position:fixed</div>
</body>
</html>

<!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>层固定</title>
<style>
*{margin:0;padding:0;}
html {position:relative;width:100%;height:100%;overflow:hidden;}
body{height:100%;width:100%;background:#EFEFEF;height:100%;overflow:auto;}
#a{width:300px;height:100px;background:red;position:fixed;right:20px;bottom:0px;}
</style>
<script>
var isie6 = window.XMLHttpRequest?false:true;
window.onload = function(){
var a = document.getElementById('a');
var d = document.getElementById('d');
if(isie6){
a.style.position = 'absolute';
window.onscroll = function(){
d.innerHTML = '111';
}
}
}
</script>
</head>
<body>
<div id ="d" style="display:none;">11</div>
<div id='a'>test</div>
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</body>
</html>

小样儿(ShowYounger)