var speed=15;
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)}