function autoScrolling(id, speed) {
    var box = document.getElementById(id);
    if(typeof speed == 'undefined') var speed = 26;
    var step = 1;

    if(speed > 60) {
	speed = 60;
	step = parseInt((speed - 60)/10);
    }
    var frameInterval = 1000 / speed;

    setInterval(function(){
	var scrollLeftOld = box.scrollLeft;
	box.scrollLeft += step;
	if(scrollLeftOld == box.scrollLeft) {
	    step *= -1;
	}
    }, frameInterval);
}