work on adding support for email attachments

booking.admin.inc

@@ -84,6 +84,15 @@ function booking_admin() {
     '#maxlength' => 3,
     '#default_value' => variable_get('booking_custom_email_count', '5')
   );
+  $form['email']['booking_email_allowed_attachments'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Allowed email attachments'),
+    '#description' => t("File extensions to allow as email attachments for the manual email page."),
+    '#size' => 60,
+    '#maxlength' => 150,
+    '#required' => TRUE,
+    '#default_value' => variable_get('booking_email_allowed_attachments', 'pdf docx'),
+  );  
   
   $form['attendee'] = array(
     '#type' => 'fieldset',