JQuery 浮动广告

<!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>跟随广告实例</title>
<style type="text/css">

</style>
<script type="text/javascript" src="http://www.enjoyeasy.com.cn/js/jquery.min.js"></script>
<script type="text/javascript">
  $(function(){
   var name = $('#ad');  //滚动广告的ID
   function showAd(time){
     setTimeout(function(){
      $(name).show();},time);
    }

   function hideAd(time){
     setTimeout(function(){
      $(name).hide();},time);
    }

   $('#close').click(function(){
     $(name).hide();
    });


   showAd(1000); //页面加载完毕多久后显示广告

   //hideAd(3000); //页面加载完毕多久后关闭广告

   function scrollAd(){
     var offset = $(window).height() - $(name).height() + $(document).scrollTop();
     $(name).animate({top:offset},{duration:800,queue:false});
    }

   scrollAd();

   $(window).scroll(scrollAd);
  });
</script>
</head>

<body>

<div id="ad">
<span id="close">sdfsdfsddfgdfgdfgdfgdfg</span>
</div>

</body>
</html>