var speed=300
demo2.innerHTML=demo1.innerHTML 
function Marquee(){ 
var mm_mo = demo.offsetHeight - demo1.offsetHeight;
if(mm_mo<0) mm_mo=0;
if(demo2.offsetHeight-demo.scrollTop<=mm_mo) 
demo.scrollTop-=demo1.offsetHeight 
else{ 
demo.scrollTop+=5
} 
} 
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}