var speed=45
    demo2.innerHTML=demo1.innerHTML
    function Marquee(){
    if(demo2.offsetTop-demo.scrollTop<=0)
    demo.scrollTop-=demo1.offsetHeight
    else{
    demo.scrollTop++
    }
    }
    var MyMar=setInterval(Marquee,speed)
    demo.onmouseover=function() {clearInterval(MyMar)}
    demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}