scrollSomething

gistfile1

    function scrollSomething($sidebar, $window, topPadding){
        var offset = $sidebar.offset();
        $window.scroll(function() {
            if ($window.scrollTop() > offset.top) {
                $sidebar.stop().animate({
                    marginTop: $window.scrollTop() - offset.top + topPadding
                }, {duration: 700, easing: 'easeOutCubic'});
            } else {
                $sidebar.stop().animate({
                    marginTop: 0
                }, {duration: 700, easing: 'easeIn'});
            }
        });
    }