One of those little 'gotchas' in HTML/Javascript ... if you're happily attempting to submit a form using the 'document.form.submit()' tied to an event (such as an 'onChange' on a select box) then you must make sure that 'submit' is actually the function/method 'submit' and not an element on your page.
By that, I mean, you might have a "normal" submit button that you've called 'submit'. And that will "not be a function" so it won't go submitting the form if you invoke it.
Nice post on it: http://thedesignspace.net/MT2archives/000292.html
In the past I've always "blanket-covered" my submit button by using id='submit', name='submit', and type='submit'. Not so in future.
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