you will have to do this with javascript on the client side with an
onClick() call in the submit button. but the bad thing is, you wont be
able to check this with the mysql db, unless you load the entire field set
into the current page.
my suggestion would be to send the form to one single
I wouldn't use header() in this case, unless you plan to create an ungodly
looking URL to pass with it.. All you really need to do is point the form
to a PHP script that validates the information. Then at the end of that
script either include() the form hander if it's valid, or print an error
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