$(function () { // run this code on page load (AKA DOM load)

        /* set variables locally for increased performance */
        var scroll_timer;
        var displayed = false;
        var $message = $('#message a');
        var $window = $(window);
        var top = $(document.body).children(0).position().top;

        /* react to scroll event on window */
        $window.scroll(function () {
                window.clearTimeout(scroll_timer);
                scroll_timer = window.setTimeout(function () { // use a timer for performance
                        if($window.scrollTop() <= top) // hide if at the top of the page
                        {
                                displayed = false;
                                $message.fadeOut(500);
                        }
                        else if(displayed == false) // show if scrolling down
                        {
                                displayed = true;
                                $message.stop(true, true).show().click(function () { $message.fadeOut(500); });
                        }
                }, 100);
        });
});