var speed=30    
demo2.innerHTML=demo1.innerHTML    
function Marquee(){    
if(demo2.offsetWidth-demo.scrollLeft<=0)    
demo.scrollLeft-=demo1.offsetWidth    
else{    
demo.scrollLeft++    
}    
}    
var MyMar=setInterval(Marquee,speed)    
demo.onmouseover=function() {clearInterval(MyMar)}    
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}