autopager.js

 // Make sure that autopager plugin is loaded
            if ($.autopager) {
                if (!autopager_was_initialised) {
                    autopager_was_initialised = true;
                        var container = '#courses div.content';
                        var items_selector = container + ' > .course';
                        var pager_selector = container + ' > div.item-list ul.pager';
                        var next_selector = container + ' ' + 'li.pager-next a:first';
                        var img = '<div id="autopager-ajax-loader"><div class="ajax-loader"></div></div>';
                        $(pager_selector).hide();
                        var handle = $.autopager({
                            appendTo:container,
                            content:items_selector,
                            link:next_selector,
                            page:0,
                            start:function () {
                                $(container).after(img);
                            },
                            load:function () {
                                $('div#autopager-ajax-loader').remove();
                                Drupal.attachBehaviors(this);
                            }
                        });

                        // Trigger autoload if content height is less than doc height already
                        var prev_content_height = $(container).height();
                        do {
                            var last = $(items_selector).filter(':last');
                            if (last.offset().top + last.height() < $(document).scrollTop() + $(window).height()) {
                                last = $(items_selector).filter(':last');
                                handle.autopager('load');
                            }
                            else {
                                break;
                            }
                        }
                        while ($(container).height() > prev_content_height);


                }