sticky scroller from stackexchange websites

se-scroller.js

function moveScroller() {
    var width = $('#scroller').width();

    var move = function () {
        var st = $(window).scrollTop();
        var ot = $('#scroller-anchor').offset().top;
        var s = $('#scroller');
        if (st > ot) {
            if (s.height() > $(window).height()) {
                s.css({ 'position': 'fixed', 'top': '', 'bottom': '0px', 'width': width });
            } else {
                s.css({ 'position': 'fixed', 'top': '0px', 'bottom': '', 'width': width });
            }
        }
        else if (st <= ot)
            s.css({ 'position': 'relative', 'top': '', 'bottom': '' });
    };

    $(window).scroll(move).resize(move);
    move();
}