It's real simple. All you need to do is call a javascript function in a html " onsubmit " in the form tag as a javascript return, like this <form method="post" action="dosomething.php" onsubmit="return validateForm();"> If the code completes ok, the form is then sent to the page listed in "action" http://www.w3schools.com/js/js_form_validation.asp If the function specified in the onsubmit returns false, then the form is not sent to the page mentioned in action.
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