help with onseek and selectors

Question

I am using this:

 $(function() {

            // initialize scrollable
            window.api = $("div.scrollable").scrollable({
                clickable: true,
                activeClass: "active",
                onSeek: function() {
                    alert("current position is: " + this.getIndex());
                    //remove highlighting from all images
                    $(".items img").removeClass("selected");
                    var position = this.getIndex().toString();
                    var thisItem = $(".items:nth-child(" + position + ")");
                    //var thisItem = allItems(this.getIndex);
                    alert("item is: " + $(this).attr('alt'));
                    changeimage($(".items:nth-child(2)"));
                }
            }).circular().autoscroll({
                interval: 4000,
                api: true,
                autoplay: false,
                steps: 1

            });

        });

(just testing) so that I can parse the current item to my changeimage() function But all I get in my alerts are undefined. WHat do I need to do here to get the current item