无缝滚动,关于javascript无缝滚动

找了些以前写的代码发现有好多浏览器开始出现兼容问题，实在头疼，于是对照HTML手写总出问题，一般说来始终无法无缝，从下往上中间留白过多，鼠标移动停留效果也没有。找了个兼容IE6,7,8代码
div内 width和height 可自由改变带下！img 为图片地址
<div id=demo style="overflow:hidden; width:191px; height:237px;">
<div id=demo1>
<img src="images/gd1.jpg" />
<img src="images/gd2.jpg" />
<img src="images/gd1.jpg" />
<img src="images/gd2.jpg" />
<img src="images/gd1.jpg" />
<img src="images/gd2.jpg" />
<img src="images/gd1.jpg" />
<img src="images/gd2.jpg" />
</div>
<div id=demo2></div>
</div>
<script language="javascript">
var speed=30
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetTop-demo.scrollTop<=0)
demo.scrollTop-=demo1.offsetHeight
else{
demo.scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>

延伸阅读