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)}