Is there some kind of trick involved?  Here's how I would envision it

1) User tries submitting the form
2) Event.observe captures this and sends an AJAX request to a special
validation URL (PHP using Codeigniter)
3) If no errors were returned, continue submitting the original form
4) If errors were found, cancel form submission and display

Mostly, I can't seem to get a separate AJAX validation request to work
as the form continues submitting.  I could use Event.stop(event), but
have not found a way to re-start the process if no validation errors
exist from the validation call.  I'd post code, but I have about 15
examples of things I've tried and it would just clutter this question.

Any ideas?  :-(  I didn't think form validation would be this

Many thanks,
- Matt

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