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1. drupal
   1. drupal6

Validate the site-wide contact page form submission.

Code

modules/contact/contact.pages.inc, line 107

<?php
function contact_mail_page_validate($form, &$form_state) {
  if (!$form_state['values']['cid']) {
    form_set_error('cid', t('You must select a valid category.'));
  }
  if (!valid_email_address($form_state['values']['mail'])) {
    form_set_error('mail', t('You must enter a valid e-mail address.'));
  }
}
?>