var speed=50
document.getElementById('demo2').innerHTML=document.getElementById('demo1').innerHTML
function Marquee(){
if(document.getElementById('demo2').offsetTop-document.getElementById('demo').scrollTop<=0)
document.getElementById('demo').scrollTop-=document.getElementById('demo1').offsetHeight
else{
document.getElementById('demo').scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
document.getElementById('demo').onmouseover=function() {clearInterval(MyMar)}
document.getElementById('demo').onmouseout=function() {MyMar=setInterval(Marquee,speed)}