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)}