var speed=10                                       
  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)}