var speed=3
  //demo2.innerHTML=demo1.innerHTML
  document.getElementById("demo2").innerHTML=document.getElementById("demo1").innerHTML
  
  function Marquee(){
  if(document.getElementById("demo2").offsetWidth-document.getElementById("demo").scrollLeft<=0)
  document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth
  else{
  document.getElementById("demo").scrollLeft++
  }
  }
  var MyMar=setInterval(Marquee,speed)
  demo.onmouseover=function() {clearInterval(MyMar)}
  demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}