var speed=30 
demox2.innerHTML=demox1.innerHTML
function Marquee(){ 
if(demox2.offsetTop-demox.scrollTop<=0) 
demox.scrollTop-=demox1.offsetHeight
else{ 
demox.scrollTop++ 
} 
} 
var MyMar=setInterval(Marquee,speed)
demox.onmouseover=function() {clearInterval(MyMar)} 
demox.onmouseout=function(){MyMar=setInterval(Marquee,speed)}