/**
 * Alter vertical tabs and put our fields into it
 **/
 
function vt_slider_api_form_alter(&$form, $form_state , $form_id) {
  $node_types = str_replace('_', '-', variable_get('vt_slider_api_source_content_type', ''));
 
  // fix for $node_types is not an array
  if (isset($node_types) && !is_array($node_types)) $node_types = array($node_types);
 
  if (is_array($node_types)) {
    foreach ($node_types as $value) {
      if ($form['#id'] != $value . '-node-form') continue;
 
      $form['vtslider_slidertype'][$form['#node']->language]['#options'] = vtslide_build_options();
 
      if (isset($form['#node']->vtslider_slidertype[$form['#node']->language][0]['value'])) {
        $form['vtslider_slidertype'][$form['#node']->language]['#default_value'] = $form['#node']->vtslider_slidertype[$form['#node']->language][0]['value'];
      }
 
      $form['vtslider_enable'][$form['#node']->language]['#options'] = array('enable' => t('Enable'), 'disable' => t('Disable'));
 
      // only add default next largest weight available if there is an empty default value
      if (empty($form['vtslider_weight'][$form['#node']->language][0]['value']['#default_value'])) {
        $form['vtslider_weight'][$form['#node']->language][0]['value']['#default_value'] = vtslide_get_max_weight(NULL);
      }
 
    }
  }
}