var speed=20 
demo2.innerHTML=demo1.innerHTML 
demo.scrollLeft=demo.scrollWidth 
function Marquee(){ 
if(demo.scrollLeft <=0) 
demo.scrollLeft+=demo2.offsetWidth 
else{ 
demo.scrollLeft-- 
} 
} 
var MyMar=setInterval(Marquee,speed) 
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}