For fear of asking too much... any ideas for the second part?

I have added into my form this;
onSubmit="valid_form();"

in the form tag, and made the php and html one page with the action the same file (check.php).

I am getting a "undefined index" error on all the variables. I think I need another php book to help me understand more of this stuff :(

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Macs and Web Design according to Guezala....