我的这段js代码为什么在火狐用不了，求大牛

Question

    <table border=0 align=center cellpadding=1 cellspacing=1 cellspace=0 >
<tr><td valign=top bgcolor=ffffff id=marquePic1>
    <table width='100%' border='0' cellspacing='0'>
    <tr><td align=center><a href='content/p1.html' target="frame"><img src="picture/2012042715271016.jpg" width=300 height=230 border=0><br>黑龙江省学生资助工作表彰大会召开</a></td>
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       <td align=center><a href='content/p3.html' target="frame"><img src="picture/2012041809315343.jpg" width=300 height=230 border=0><br>青春歌会暨第十六届最佳颁奖典礼</a></td>
       <td align=center><a href='content/p4.html' target="frame"><img src="picture/2012050217005909.jpg" width=300 height=230 border=0><br>我校聘V.N.帕尔蒙院士为特聘教授</a></td>
       <td align=center><a href='content/p5.html' target="frame"><img src="picture/2012040616053945.jpg" width=300 height=230 border=0><br>我校召开2012年春季安全工作会议</a></td>
   </tr>
   </table></td>
   <td id=marquePic2 valign=top></td></tr>
</table></div>
<script>
var speed=30
marquePic2.innerHTML=marquePic1.innerHTML 
function Marquee(){ 
if(demo.scrollLeft>=marquePic1.scrollWidth){ 
demo.scrollLeft=0 
}else{ 
demo.scrollLeft++ 
} 
} 
var MyMar=setInterval(Marquee,speed) 
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)} 
</script>

Answer 1

ie下都不行。。别说ff 了你那个demo哪里来的 （不要一味的copy代码）

Answer 2

<div class="picture">
<div id=demo style="overflow:hidden;width:750;" align=center>
    <table border=0 align=center cellpadding=1 cellspacing=1 cellspace=0 >
<tr><td valign=top bgcolor=ffffff id=marquePic1>
    <table width='100%' border='0' cellspacing='0'>
    <tr><td align=center><a href='content/p1.html' target="frame"><img src="picture/2012042715271016.jpg" width=300 height=230 border=0><br>黑龙江省学生资助工作表彰大会召开</a></td>
       <td align=center><a href='content/p2.html' target="frame"><img src="picture/2012050310200768.jpg" width=300 height=230 border=0><br>李凤林大使解析当前国际形势</a></td>
       <td align=center><a href='content/p3.html' target="frame"><img src="picture/2012041809315343.jpg" width=300 height=230 border=0><br>青春歌会暨第十六届最佳颁奖典礼</a></td>
       <td align=center><a href='content/p4.html' target="frame"><img src="picture/2012050217005909.jpg" width=300 height=230 border=0><br>我校聘V.N.帕尔蒙院士为特聘教授</a></td>
       <td align=center><a href='content/p5.html' target="frame"><img src="picture/2012040616053945.jpg" width=300 height=230 border=0><br>我校召开2012年春季安全工作会议</a></td>
   </tr>
   </table></td>
   <td id=marquePic2 valign=top></td></tr>
</table></div>
<script>
var speed=30
marquePic2.innerHTML=marquePic1.innerHTML 
function Marquee(){ 
if(demo.scrollLeft>=marquePic1.scrollWidth){ 
demo.scrollLeft=0 
}else{ 
demo.scrollLeft++ 
} 
} 
var MyMar=setInterval(Marquee,speed) 
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)} 
</script>
.picture
{
margin-left:auto;
margin-right:auto;
margin-bottom:10px;
margin-top:10px;
width:944px;
height:250px;
font-size: 16px;
}这个是对picture的css代码