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