var interval;
function move_up(){
    document.getElementById('scroll-berita').scrollTop -= 5;
}

function scroll_up(){
    interval = setInterval('move_up()', 100);
}

function move_down(){
    document.getElementById('scroll-berita').scrollTop += 5;
}

function scroll_down(){
    interval = setInterval('move_down()', 100);
}