Joyride, the nice guide/tour library based on jQuery, does not work in older version of jQuery (like 1.3 or 1.4). We had a Drupal 6 project, where we wanted it. Our Drupal 6 site used jQuery 1.3 version.  We tweaked the joyride code to make it work in jQuery 1.3. Basically,

1. We included a function that is not a part of 1.3 version (isEmptyObject)