i.event.bind(i.scrollbarXRail, 'click', function (e) {
    var positionLeft = e.pageX - window.pageXOffset - pageOffset(i.scrollbarXRail).left;
    var direction = positionLeft > i.scrollbarXLeft ? 1 : -1;

    updateScroll(element, 'left', element.scrollLeft + direction * i.containerWidth);