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Only when all conditions have been satisfied do we reach the command, in which case the form will be submitted.
You'll see that the all validation scripts presented on this and subsequent pages adhere to the same basic format.
Normally you would modify this so that you could submit or not submit the form based on the number of items selected. For example, a text input that only needs to have a value if a checkbox is checked: Using simple logical operators and the functions supplied above you can do all sorts of client-side form validation.
That could be done using Ajax, but would make the CAPTCHA much easier to break.