Can you post (or Private Message) your URL to us for us to look at the problem? JFBConnect shouldn't conflict with jQuery, and things like JomSocial (which we integrate with) rely heavily on jQuery as well. The line you mention above is simply straight Javascript as well (no extra library), so it really shouldn't be the problem.
Unfortunately, don't have much more answers than that without seeing the problem in action right now. Hope the explanation helps, and we'll do what we can to get you going quickly once we understand the problem.
Thanks,
Alex