function job_listings_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'job_listing_node_form') {
    $form['actions']['submit']['#value'] = 'Submit';
    $form['actions']['submit']['#submit'][] = 'job_listings_submit';
  }
}

/**
 * This hijacks the submission of the Job Listing 'node add' form, and redirects to the given path
 */
function job_listings_submit($form, &$form_state) {
  $form_state['redirect'] = '/job-listing/thank-you';
}