/**
 * @author joerg
 */
function makeScrollbar(content, scrollbar, handle, horizontal, ignoreMouse){

    var slider = new Slider(scrollbar, handle, {
        steps: content.getSize().scrollSize.x - content.getSize().size.x,
        mode: (horizontal ? 'horizontal' : 'vertical'),
        onChange: function(step){
            // Scrolls the content element in x or y direction.
            var x = (horizontal ? step : 0);
            var y = (horizontal ? 0 : step);
            content.scrollTo(x, y);
        }
    }).set(0);
    if (!(ignoreMouse)) {
        // Scroll the content element when the mousewheel is used within the 
        // content or the scrollbar element.
        $$(content, scrollbar).addEvent('mousewheel', function(e){
            e = new Event(e).stop();
            var step = slider.step - e.wheel * 30;
            slider.set(step);
        });
    }
    // Stops the handle dragging process when the mouse leaves the document body.
    $(document.body).addEvent('mouseleave', function(){
        slider.drag.stop()
    });
}