带关闭按钮的跟随窗口移动对联广告代码

http://www.xuecss3.com/qttx-25-2991-1.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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery制作对联广告悬浮特效跟随滚动条滚动-学css3网</title>
<meta name="description" content="jquery图片广告制作一个侧面浮动图片广告特效，类似滚屏效果的图片广告。jQuery下载。" />
</head>

<body>

<style type="text/css">
*{margin:0;padding:0;list-style-type:none;}
.fixediv{position:fixed;top:140px;z-index:9999;140px;height:216px;background:#ddd;}
.fixediv img{float:left;}
.fixediv a.close{display:block;height:30px;line-height:30px;background:#fff;font-size:14px;padding:0 10px;color:#5e5e5e;text-decoration:none;text-align:center;}
.leftadv{left:0px;}
.rightadv{right:0px;}
</style>

<div class="fixediv leftadv">
    <a href="http://www.xuecss3.com/"><img src="images/180.jpg" width="140" height="186" alt="性感美女" /></a>
    <a class="close" href="javascript:void(0);">关闭广告</a>
</div>

<div class="fixediv rightadv">
    <a href="http://www.xuecss3.com/"><img src="images/280.jpg" width="140" height="186" alt="清纯美女" /></a>
    <a class="close" href="javascript:void(0);">关闭广告</a>
</div>

<div style="height:1200px;"></div>


<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>

<script type="text/javascript">
$(document).ready(function(){

    $(".fixediv a").click(function(){
        
        $(".fixediv").fadeOut(400);
        
    });
    
    $(".fixediv").floatadv();
    
});

jQuery.fn.floatadv = function(loaded) {
    var obj = this;
    body_height = parseInt($(window).height());
    block_height = parseInt(obj.height());
    
    top_position = parseInt((body_height/2) - (block_height/2) + $(window).scrollTop());
    if (body_height<block_height) { top_position = 0 + $(window).scrollTop(); };
    
    if(!loaded) {
        obj.css({'position': 'absolute'});
        obj.css({ 'top': top_position });
        $(window).bind('resize', function() { 
            obj.floatadv(!loaded);
        });
        $(window).bind('scroll', function() { 
            obj.floatadv(!loaded);
        });
    } else {
        obj.stop();
        obj.css({'position': 'absolute'});
        obj.animate({ 'top': top_position }, 400, 'linear');
    }
}
</script>

</body>
</html>