var speed = 1;
var rows = 26;
var stim = 80;
var stop = 0;
demo2.innerHTML = demo1.innerHTML
function Marquee() {
    if (demo.scrollTop % rows == 0 && stop <= stim) {
        stop++;
        return;
    }
    stop = 0;
    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) }