diff --git a/booking.studygroup_leaders.inc b/booking.studygroup_leaders.inc
index 5dba411..1ae27e3 100644
--- a/booking.studygroup_leaders.inc
+++ b/booking.studygroup_leaders.inc
@@ -227,9 +227,6 @@ function booking_studygroup_leadhelp_edit_form($node, &$form_state, $group_id) {
 		return "";			
 	}
 
-	$prefix = t("<h2>Study Group &dash; !descrip</h2><p>Edit leaders and helpers for this group.</p>", 
-		array('!descrip' => $studygroup->booking_studygroup_descrip));
-
 	//define the table header
 	$header = array (
 		'sid' =>  array('data' => t('Study Group Session ID'), 'field' => 'sid'),
@@ -243,6 +240,21 @@ function booking_studygroup_leadhelp_edit_form($node, &$form_state, $group_id) {
 	  drupal_get_path('module', 'booking') . '/booking.css',
 	);
 
+	$prefix = t("<h2>Edit Leaders/Helpers for Study Group &dash; !descrip</h2>", 
+		array('!descrip' => $studygroup->booking_studygroup_descrip));
+	$prefix .= "<p>Enter part of a person's name in the text field and wait for the blue spinning circle to autocomplete with the person's details. " . 
+		"Make sure you click on the person from the dropdown list that appears.</p>";
+	$form['first_para'] = array (
+		'#type' => 'markup',
+		'#markup' => $prefix,
+	);
+
+	//add this to the form in a hidden field so we can update the right studygroup
+	$form['booking_gid'] = array (
+		'#type' => 'hidden',
+		'#value' => $group_id,
+	);
+
 	//create the container element for the whole table					
 	$form['studygroups'] = array(
 		'#prefix' => '<div id="studygroups">',
@@ -276,7 +288,6 @@ function booking_studygroup_leadhelp_edit_form($node, &$form_state, $group_id) {
 
 	//create the rows for the individual sessions (instances really) of this study group
 	for ($i = 1; $i <= $studygroup->booking_num_group_sessions; $i++) {
-
 		$leader = array (
 			'#id'   => 'booking-studygroup-leader-' . $i,
 			'#type' => 'textfield',
@@ -348,7 +359,44 @@ function booking_studygroup_leadhelp_edit_form($node, &$form_state, $group_id) {
 function booking_studygroup_leadhelp_edit_form_submit($form, &$form_state) {
 	global $event;
 
-	//$values = $form_state['input'];
+	$values = $form_state['input'];
 	watchdog('booking_debug', "<pre>Studygroup leader/helper test submission form :\n@info</pre>", array('@info' => print_r( $form_state, true)));
 
-}
\ No newline at end of file
+	$role_types = array(
+		'booking_studygroup_leader' => 1,
+		'booking_studygroup_helper' => 2,
+		'booking_studygroup_reserveleader' => 3,
+	);
+	//iterate over the different role types
+	foreach ($role_types as $type => $type_id)	{
+		//iterate over the sessions for that role type
+		foreach ($values[$type] as $session_id => $person) {
+			//get the previous value
+			$previous_value = _booking_studygroup_leadhelp_edit_get_previous_value($form, $type, $session_id);
+			//compare it against $person
+			//if $person is now empty, do a delete query
+			//if $person is now different, run an update query
+		}
+	}
+}
+
+/**
+ * look through the previous form data and return the matching element
+ */
+function _booking_studygroup_leadhelp_edit_get_previous_value(&$form, $type, $session_id) {
+	foreach($form['form']['studygroups']['#rows'] as $key => $value) {
+		watchdog('booking_debug', "<pre>Studygroup assignment checker for type !type in session !session:\n@info</pre>", 
+			array('!session' => $session_id, '!type' => $type, '@info' => print_r( $value, true)));
+		return;		
+		if ((!empty($value[$type]['data']['#value'])) && ($value[$type]['data']['#name'] == $name)) {
+			//found the correct element, extract the node id
+			$person = $value[$type]['data']['#value'];
+			if (preg_match('/[\s\w,]+\s\[(\d+)\]/i', $person, $matches)) {
+				return $matches[1];
+			}
+		}
+	}
+	
+	//in case there was no matching value, return an empty string
+	return 0;
+}