一个页面放2段图片滚动代码出现冲突的问题如何解决

<div align="center">
<table style="TABLE-LAYOUT: fixed; border-collapse:collapse" cellSpacing=0 cellPadding=0 width=760 border=1 height="150" bordercolor="#1989D7">
<tr>
<td height="150">
<div id=demo style="OVERFLOW: hidden; WIDTH: 100%; HEIGHT: 150px">
<table cellPadding=0 align=left border=0 cellspace="0">
<tr>
<td id=demo1 vAlign=top><!--$最新图片$--></td>
<td id=demo2 vAlign=top></td>
</tr>
</table>
</div>
<SCRIPT>
var speed=25
demo2.innerHTML=demo1.innerHTML
function Marquee1(){
if(demo2.offsetWidth-demo.scrollLeft<=0)
demo.scrollLeft-=demo1.offsetWidth
else{
demo.scrollLeft++
}
}
var MyMar=setInterval(Marquee1,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee1,speed)}
</SCRIPT>

<!--第二段向右滚动代码开始-->
<div id=gundong style="OVERFLOW: hidden; WIDTH: 568px; HEIGHT: 126px">
<table cellPadding=0 align=left border=0 cellspace="0">
<tr>
<td id=gundong1 vAlign=top>
<!--{$GetPicPhoto(3,0,true,0,20,false,false,0,1,1,126,90,20,0,true,20)}--> </td>
<td id=gundong2 vAlign=top></td>
</tr>
</table>
</div>
<script>
var speed=25
gundong2.innerHTML=gundong1.innerHTML
gundong.scrollLeft=gundong.scrollWidth
function Marquee1(){
if(gundong.scrollLeft<=0)
gundong.scrollLeft+=gundong2.offsetWidth
else{
gundong.scrollLeft--
}
}
var MyMar1=setInterval(Marquee1, speed)
gundong.onmouseover=function() {clearInterval(MyMar1)}
gundong.onmouseout=function() {MyMar1=setInterval(Marquee1, speed)}
</script>
<!--第二段向右滚动代码结束-->