var speed=30;
demo2.innerHTML=demo1.innerHTML;	

function Marquee(){
	if(demo2.offsetHeight<=demo.scrollTop){	
		demo.scrollTop=demo.scrollTop-demo1.offsetHeight;		
	}
	else{
		demo.scrollTop++;
	}
}

var MyMar=setInterval(Marquee,speed);	

demo.onmouseover=function() {clearInterval(MyMar);}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed);}