一个实用的纵向滚动代码

1. <div id=demo style=overflow:hidden;height:100;width:20;
2. background:#214984;color:#ffffff> 
3. <div id=demo1> 
4.  <img src="images/smilies/icon_mrgreen.gif"> 
5.  <img src="images/smilies/icon_mrgreen.gif"> 
6.  <img src="images/smilies/icon_mrgreen.gif"> 
7.  <img src="images/smilies/icon_mrgreen.gif"> 
8.  <img src="images/smilies/icon_mrgreen.gif"> 
9.  <img src="images/smilies/icon_mrgreen.gif"> 
10.  <img src="images/smilies/icon_mrgreen.gif"> 
11.  <img src="images/smilies/icon_mrgreen.gif"> 
12.  <img src="images/smilies/icon_mrgreen.gif"> 
13.  </div> 
14.  <div id=demo2></div> 
15.  </div> 
16.    <script> 
17.    var speed=30
18.    demo2.innerHTML=demo1.innerHTML //克隆demo1为demo2
19.    function Marquee(){ //当滚动至demo1与demo2交界时
20. if(demo2.offsetTop-demo.scrollTop<=0)  
21. demo.scrollTop-=demo1.offsetHeight //demo跳到最顶端
22. else{
23. demo.scrollTop++
24.    }
25.    }
26.    var MyMar=setInterval(Marquee,speed)//设置定时器
27. //鼠标移上时清除定时器达到滚动停止的目的
28.    demo.onmouseover=function() {clearInterval(MyMar)}
29. //鼠标移开时重设定时器
30.    demo.onmouseout=function(){MyMar=setInterval(Marquee,speed)}
31. </script>