最简单的通用浮动 悬浮 DIV 层
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >
<head>
<style type="text/css">
body {
margin:0; /* 必须 */
border:0;
height:100%; /* 必须 */
overflow-y:auto;/* 必须 */
}
#menu {display:block; top:10px; left:150px; width:130px; position:fixed;} /* IE并不认识fixed，而FF认识 */
* html #menu {position:absolute;} /* 这个只有IE认识 */
</style>
<!--[if IE 6]>
<style type="text/css">
/*<![CDATA[*/
html {overflow-x:auto; overflow-y:hidden;}
/*]]>*/
</style>
<![endif]-->
</head>
<body>
<div>
<ul style="list-style-type:decimal">
<script language=javascript>
for(i=0;i<500;i++) document.write('<li></li>');
</script></ul>
</div>
<div id="menu">
<img src="http://www.cnblogs.com/images/cnblogs_com/goodspeed/795/o_o_mylogo.gif" />
</div>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >
<head>
<style type="text/css">
body {
margin:0; /* 必须 */
border:0;
height:100%; /* 必须 */
overflow-y:auto;/* 必须 */
}
#menu {display:block; top:10px; left:150px; width:130px; position:fixed;} /* IE并不认识fixed，而FF认识 */
* html #menu {position:absolute;} /* 这个只有IE认识 */
</style>
<!--[if IE 6]>
<style type="text/css">
/*<![CDATA[*/
html {overflow-x:auto; overflow-y:hidden;}
/*]]>*/
</style>
<![endif]-->
</head>
<body>
<div>
<ul style="list-style-type:decimal">
<script language=javascript>
for(i=0;i<500;i++) document.write('<li></li>');
</script></ul>
</div>
<div id="menu">
<img src="http://www.cnblogs.com/images/cnblogs_com/goodspeed/795/o_o_mylogo.gif" />
</div>
</body>
</html>
