滚动双联广告

一个简单的效果，主要考验对queue的理解。

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>test-group-following</title>

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.3.min.js"></script>
<style type="text/css">
*{margin:0;padding:0;}
body{font:12px/1.5 arial;background:#fff;}
img{border:none 0;}
.scroll{position:absolute;left:10px;}
.scroll-outer{position:relative;width:145px;height:300px;}
.scroll-cont{position:absolute;top:0;left:0;height:280px;border:1px solid #cc0;background:#f1f1f1;}
.scroll-close{position:absolute;bottom:0;right:0;display:block;text-decoration:none;}
.scroll-close:hover{color:#c00;}
</style>
</head>
<body>
<div style="height:3000px;"></div>
<div class="scroll">
<div class="scroll-outer">
<div class="scroll-cont">
<a href="#" target="_blank">
<img width="143" height="280" src="http://guniangwang.com/user_upload_img/713/201212/s/20121231110033.jpg" alt="" />
</a>
</div>
<a href="javascript:void(0)" class="scroll-close">关闭</a>
</div>
</div>  
<script type="text/javascript">
(function($){
$.fn.dual = function(options){
var defaults  = {
delaytime : 1000
},
opts          = $.extend(defaults, options),
win  = $(window),
right         = this.clone().appendTo('body'), // clone other
center        = (win.height() - this.height()) / 2,
ele           = $('.scroll'),
close         = ele.find('.scroll-close');
right.css({left: 'auto', right: '10px'}); // initialize
return ele.each(function(){
var that = $(this);
$(this).css({top: center});
win.scroll(function(){
that.animate({top: center + win.scrollTop()}, {duration: opts.delaytime, queue: false});
});
close.click(function(){
that.hide();
});
});
}
}(jQuery));
$('.scroll').dual(); // call
</script>   
</body>
</html>

Form: