I'm afraid that the first thing you need to do is find a JavaScript forum to take your problem to. This is a Perl forum, and I can't help but suspect that those who reply after me won't be quite as polite.
That having been said, if you come to the realization that you're better-off doing the sanity check in a cleaner language, and simply re-painting the form with badly-formed fields noted (red is usually a good color for this sort of thing) while carrying over the valid form fields as "sticky" values, then you will have the luxury of using URI, which is a very clean, easy-to-use module that should handle more URI issues than you're likely to throw at it.
--rjray
