这段js代码如何才能让火狐兼容呀！急用，等！！！

Question

这是图片滚动的代码，在别的浏览器都可以正常应用，但在火狐上就失效了，肯定是兼容性问题吧  ，大牛们帮忙改下这段js吧， <script type="text/javascript">
                     var LeftMyMar;
                     var MyMar;
                     var speed=30;
                     function  MarqueeLeft()
                     {
                      clearInterval(MyMar)
                      demo2.innerHTML=demo1.innerHTML
                      //向左走
                      function Marquee(){
                       if(demo2.offsetWidth-demo.scrollLeft<=0)
                        demo.scrollLeft-=demo1.offsetWidth
                       else{
                        demo.scrollLeft++
                       }
                      }
                      LeftMyMar=setInterval(Marquee,speed)
                      demo.onmouseover=function() {clearInterval(LeftMyMar)}
                      demo.onmouseout=function() {LeftMyMar=setInterval(Marquee,speed)}
                     }
                     MarqueeLeft();
        </script>

Answer 1

自己去看吧。http://www.ok22.org/art_detail.aspx?id=114
【js文字上下滚动+左右滚动兼容FF/IE】

Answer 2

<script type="text/javascript">
                     var LeftMyMar;
                     var MyMar;
                     var speed=30;
                     function  MarqueeLeft()
                     {
                      clearInterval(MyMar)
                      document.getElementById('demo2').innerHTML=document.getElementById('demo1').innerHTML
                      //向左走
                      function Marquee(){
                       if(document.getElementById('demo2').offsetWidth-demo.scrollLeft<=0)
                        document.getElementById('demo').scrollLeft-=document.getElementById('demo1').offsetWidth
                       else{
                        document.getElementById('demo').scrollLeft++
                       }
                      }
                      LeftMyMar=setInterval(Marquee,speed)
                      document.getElementById('demo').onmouseover=function() {clearInterval(LeftMyMar)}
                      document.getElementById('demo').onmouseout=function() {LeftMyMar=setInterval(Marquee,speed)}
                     }
                     MarqueeLeft();
        </script>