javaEE，web开发的问题，急急急！！！

这几天在做一个网页，有文字滚动的效果，做好了如下代码在IE上可以正常运行，但是在火狐上就不行了，那位大侠帮帮小弟呀
<div id="neirong" >
<table >
<tr><td>sssss</td><tr/>
<tr><td>sssss</td><tr/>
<tr><td>sssss</td><tr/>
<tr><td>sssss</td><tr/>
<tr><td>sssss</td><tr/>
<tr><td>sssss</td><tr/>
</table>
<div id="neirong2" style="position:absolute;z-index:1;visibility:hidden"></div>
<script>
marqueesHeight=355;//滚动区域高度设定
stopscroll=false;
neirong.scrollTop=0;
with(neirong){
style.width=0;
style.height=marqueesHeight;
style.overflowX="visible";
style.overflowY="hidden";
noWrap=true;
onmouseover=new Function("stopscroll=true");
onmouseout=new Function("stopscroll=false");
}
preTop=0; currentTop=0; stoptime=0;
function initsrolltext(){
neirong2.innerHTML="";
neirong2.innerHTML+=neirong.innerHTML;
neirong.innerHTML=neirong2.innerHTML+neirong2.innerHTML;
setInterval("scroUp()",20);
}
function scroUp(){
if(stopscroll==true) return;
currentTop+=1;
if(currentTop==100)//向上滚动高度设定
{
stoptime+=1;
currentTop-=1;
if(stoptime==1)//停顿时间设定
{
currentTop=0;
stoptime=0;
}
}
else {
preTop=neirong.scrollTop;
neirong.scrollTop+=1;
if(preTop==neirong.scrollTop){
neirong.scrollTop=neirong2.offsetHeight-marqueesHeight;
neirong.scrollTop+=1;
}
}
}
initsrolltext();
</script>

</div>