var speed=30
var tab = document.getElementById("demo");
var tab1 = document.getElementById("demo1");
var tab2 = document.getElementById("demo2");

tab2.innerHTML=tab1.innerHTML;
function Marquee(){
if(tab2.offsetTop-tab.scrollTop<=0)
tab.scrollTop-=tab1.offsetHeight;
else{
tab.scrollTop++;
}
}
var MyMar=setInterval(Marquee,speed)
tab.onmouseover=function() {clearInterval(MyMar)}
tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)}