var speed=40
   demo4.innerHTML=demo3.innerHTML
   function Marquee(){
   if(demo4.offsetTop-demoo.scrollTop<=0)
   demoo.scrollTop-=demo3.offsetHeight
   else{
   demoo.scrollTop++
   }
   }
   var MyMar=setInterval(Marquee,speed)
   demoo.onmouseover=function() {clearInterval(MyMar)}
   demoo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}