两侧跟随广告

1   <div class="left"><img src="images/1.gif" alt=""/></div>
2     <div class="right"><img src="images/2.gif" alt=""/></div>

 1 .left,.right{
 2             position: absolute;
 3             top:80px;
 4         }
 5         .left{
 6             left: 0;
 7         }
 8         .right{
 9             right: 0;
10         }

1   $(function(){
2             $(window).scroll(function () {
3                 var top = $(document).scrollTop();
4                 $(".left").stop().animate({"top" : top + 50},600);
5                 $(".right").stop().animate({"top" : top + 50},600);
6                 
7                 // $(".left,.right").stop().animate({"top" : top + 50},600);
8             });
9         });