make previous sw question configurable

booking.admin.inc

@@ -706,6 +706,16 @@ function booking_admin() {
     ),
     '#default_value' => variable_get('booking_enable_previous_studyweeks', 0)
   );
+  $form['regn_options']['booking_require_previous_sw'] = array(
+    '#type' => 'radios',
+    '#title' => t('Require attendees to select number of previous study weeks?'),
+    '#description' => t('Select whether to require attendees to choose the number of study weeks they previously attended. Doesn\'t have any effect if previous studyweek question is not enabled above.'),
+    '#options' => array(
+      0 => t('No'),
+      t('Yes')
+    ),
+    '#default_value' => variable_get('booking_require_previous_sw', 0)
+  );  
   $form['management'] = array(
     '#type' => 'fieldset',
     '#title' => 'Data Management Options',