function upScroll()
{
    var speed=30;
    var tab=document.getElementById("demo");
    var tab1=document.getElementById("demo1");
    var tab2=document.getElementById("demo2");
    tab2.innerHTML=tab1.innerHTML;
    function Marqquee(){
    if(tab2.offsetTop-tab.scrollTop<=0)
    tab.scrollTop-=tab1.offsetHeight 
    else{
    tab.scrollTop++
    }
    }
    var MyMar=setInterval(Marqquee,speed);
    tab.onmouseover=function() {clearInterval(MyMar)};
    tab.onmouseout=function() {MyMar=setInterval(Marqquee,speed)};
}