update form to ask previous sw question

booking.regn_form.inc

@@ -957,6 +957,15 @@ function booking_form($node, &$form_state, $inserting = FALSE)
       '#default_value' => !empty($data->booking_freestyle_text) ? $data->booking_freestyle_text : ''
     );
   }
+  if (variable_get('booking_enable_previous_studyweeks', 0) == 1) {
+    $form['misc-areas']['booking_prev_sw_count'] = array(
+      '#type' => 'select',
+      '#title' => t("How many Study Weeks have you been to previously?"),
+      '#required' => FALSE,
+      '#default_value' => variable_get('booking_prev_sw_count', empty($data->booking_prev_sw_count) ? '' : $data->booking_prev_sw_count),
+      '#options' => _get_previous_sw_options(),
+    );
+  }
 
   // https://www.lullabot.com/articles/a-beginners-guide-to-caching-data-in-drupal-7
   // This code will only cache this one element