var speed=45;
var logotab=document.getElementById("demo");
var logotab1 = document.getElementById("demo1");
var logotab2 = document.getElementById("demo2");
var marquee2 = document.getElementById("demo3");
logotab2.innerHTML = logotab1.innerHTML;
marquee2.style.height = logotab1.offsetHeight * 2;
function Marquee(){
    if (logotab2.offsetTop - logotab.scrollTop <= 0)
        logotab.scrollTop -= logotab1.offsetTop
else{
    logotab.scrollTop++;
}
}
var MyMar=setInterval(Marquee,speed);
logotab.onmouseover = function () { clearInterval(MyMar) };
logotab.onmouseout = function () { MyMar = setInterval(Marquee, speed) };