图片滚动js

      <script>
<!--
var ospeed1=25;
var opab=document.getElementById("pro_demo");
var opab1=document.getElementById("pro_demo1");
var opab2=document.getElementById("pro_demo2");
opab2.innerHTML=opab1.innerHTML;
function oMarquee1(){
if(opab2.offsetWidth-opab.scrollLeft<=0)
opab.scrollLeft-=opab1.offsetWidth
else{
opab.scrollLeft++;
}
}
var oMyMar1=setInterval(oMarquee1,ospeed1);
opab.onmouseover=function() {clearInterval(oMyMar1)};
opab.onmouseout=function() {oMyMar1=setInterval(oMarquee1,ospeed1)};
-->
 </script>