var laufband_wrapper = $('laufband-wrapper');
var laufband         = $('laufband');
var duration         = 200; // ms
var step             = 10; // px
var theend           = false;

function scroll_left() {
    if(theend) {
        var next_scroll = laufband_wrapper.getScroll().x - step;
        if(next_scroll.toInt() <= 0) {
            theend = false;
        } else {
            laufband_wrapper.scrollTo(next_scroll, 0);
        }
    }
}

function scroll_right() {
    if(!theend) {
        var max_scroll  = (laufband_wrapper.getScrollSize().x - 604);
        var next_scroll = laufband_wrapper.getScroll().x + step;
        if(next_scroll.toInt() >= max_scroll.toInt()) {
            theend = true;
        } else {
            laufband_wrapper.scrollTo(next_scroll, 0);
        }
    }
}

if(laufband != null) {
    var scroller_right = scroll_right.periodical(duration);
    var scroller_left  = scroll_left.periodical(duration);
}