diff --git a/booking.variety_form.inc b/booking.variety_form.inc
index b20460a..3ec4256 100644
--- a/booking.variety_form.inc
+++ b/booking.variety_form.inc
@@ -12,7 +12,6 @@ function booking_variety_regn_form($node, &$form_state)
 	global $event;
 	$form = array ();
 	$data = $node;
-	$timeslot_count = 0;
 	
 	$query = db_query("SELECT * FROM {booking_variety_times} WHERE booking_eventid = :eid AND booking_variety_status = 1", 
             array(':eid' => $event->eid));	
@@ -58,29 +57,47 @@ function booking_variety_regn_form($node, &$form_state)
 		}
 		
 		//create the form element for this timeslot
-		$form['select-variety-' . $timeslot_count] = array(
+		$form['select-variety-' . $timeslot->tid] = array(
 			'#type' => 'select',
 			'#title' => t('Variety Session: ' . $timeslot->booking_variety_time_descrip),
 			'#required' => TRUE,
 			'#default_value' => '',
-			'#options' => $options,
+      '#options' => _booking_get_variety_timeslot_options($timeslot->tid),
 		);
-		
-		$timeslot_count++;
 	}	
 	
-	$form['submit'] = array
-	(
+	$form['submit'] = array(
 		'#type' => 'submit',
 		'#value' => t('Submit'),
 	);	
 
 	return array (
 		'form' => $form,
-	);	
-	
+	);
 }
 
+/**
+ * Function to calculate available variety sessions for ajax enabled form booking_variety_regn_form()
+ * @param $timeslot_id - the timeslot ID to query
+ * @return array containing the variety sessions for specified timeslot that still have capacity
+ */
+function _booking_get_variety_timeslot_options($timeslot_id) {
+  $session_options = array();
+	$session_options[] = "--";
+	
+	$session_query = db_query("SELECT * FROM {booking_variety_options} WHERE booking_variety_timeslot_id = :tid AND booking_variety_status = 1",
+		array(':tid' => $timeslot_id));
+  
+  // Only add sessions that aren't full to the return result
+	foreach($session_query as $session) {
+    if ($session->booking_variety_regncount < $session->booking_variety_maxsize) {
+      $session_options[$session->vid] = $session->booking_variety_descrip;
+    }
+	}	
+	watchdog('booking_debug', "<pre>Variety Session Options:\n@info</pre>", array('@info' => print_r( $session_options, true)));
+	
+	return $session_options;
+}
 
 /**
  * Callback function to verify if barcode was valid