Rails - Jan 2010 - how do I call a Javascript function post-AJAX form submit?

Here''s my simple problem.  I can''t call a javascript function
that''s
included in a page after an AJAX post.  I think I''ve encountered
something similar in the past, but can''t recall the solution. 
Here''s
my setup:

I have a form on a webpage that submits via AJAX using JQuery and
JQuery-form.  This is what it does:

1. User clicks checkboxes in the form to select any number of users to
send message to.
2. User clicks submit, which triggers an AJAX post
3. respond_to js opens a hidden div generated from a partial which is
displayed in a fancybox lightbox
4. The partial shown in the lightbox contains a text area with a
character count which will not update when I type in the field!
    - If I just render this partial on the page, the character count
update works fine.  I just can''t get it to work post-AJAX.

I''m happy to post code, but I''m wondering if there''s
a general rule
that I''m missing.

Any ideas?

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