var speed=40 
demo2.innerHTML=demo1.innerHTML 
function Marquee(){ 
if(demo.scrollLeft <= 100) 
demo.scrollLeft+=demo1.offsetWidth 
else{ 
demo.scrollLeft--
} 
} 
var MyMar=setInterval(Marquee,speed) 
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}