var speed=30
demo_i2.innerHTML=demo_i1.innerHTML
function Marquee(){
if(demo_i2.offsetTop-demo_i.scrollTop<=0)
demo_i.scrollTop-=demo_i1.offsetHeight
else{
demo_i.scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
demo_i.onmouseover=function(){clearInterval(MyMar)}
demo_i.onmouseout=function(){MyMar=setInterval(Marquee,speed)}