Index: lams_central/web/main.jsp
===================================================================
diff -u -rb95781db2e9d9e1fc05049dcd87a4454cde63565 -rb090a6262d9b6112946ecf59cbc9b13de7a1caad
--- lams_central/web/main.jsp	(.../main.jsp)	(revision b95781db2e9d9e1fc05049dcd87a4454cde63565)
+++ lams_central/web/main.jsp	(.../main.jsp)	(revision b090a6262d9b6112946ecf59cbc9b13de7a1caad)
@@ -49,7 +49,10 @@
 					jQuery(element).Sortable({
 						accept: "j-single-lesson",
 						axis: "vertically",
-						// containment: "parent",
+						containment: [jQuery(element).offset().left,
+							jQuery(element).offset().top,
+							jQuery(element).width(),
+							jQuery(element).height()],
 						onStop: function s() {
 							var ids = [];
 							jQuery(this).parent().children("p").each(function(i, element) {