var speed=30 
var myspeed=1;
demo2.innerHTML=demo1.innerHTML 
function Marquee(){ 
if(demo2.offsetWidth-demo.scrollLeft<=0) 
demo.scrollLeft-=demo1.offsetWidth 
else{ 
demo.scrollLeft += myspeed;
} 
} 
var MyMar=setInterval(Marquee,speed) 
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)} 
function SetSpeed(t){
	if(t){
		if(myspeed <= 10)
			myspeed += 1;
	}else{
		if(myspeed >= 2)
			myspeed -= 1;
		}
}