Index: lams_central/web/includes/javascript/addLesson.js
===================================================================
diff -u -rd0a8679bc756e47321aff67f3ed1eb737b8535ff -r33f9914fba416faeaa89be285fa2cd182c4d29ed
--- lams_central/web/includes/javascript/addLesson.js	(.../addLesson.js)	(revision d0a8679bc756e47321aff67f3ed1eb737b8535ff)
+++ lams_central/web/includes/javascript/addLesson.js	(.../addLesson.js)	(revision 33f9914fba416faeaa89be285fa2cd182c4d29ed)
@@ -423,7 +423,7 @@
 			$.ajax({
 				url : LAMS_URL + 'monitoring/monitoring/startPreviewLesson.do',
 				data : {
-s					'lessonID' : lessonID
+					'lessonID' : lessonID
 				},
 				cache : false,
 				dataType : 'text',