Index: lams_central/web/includes/javascript/main.js
===================================================================
diff -u -r96c176f362cecb4f3ac20dc2e9bae64bbbc2b5a6 -r36fb06c7f09815dfbc7cae996603eb39be2ae0de
--- lams_central/web/includes/javascript/main.js	(.../main.js)	(revision 96c176f362cecb4f3ac20dc2e9bae64bbbc2b5a6)
+++ lams_central/web/includes/javascript/main.js	(.../main.js)	(revision 36fb06c7f09815dfbc7cae996603eb39be2ae0de)
@@ -293,15 +293,17 @@
 	}
 }
 
+/**
+ * Adjust the position of LD SVG in Monitoring.
+ */
 function resizeSequenceCanvas(){
-	var body = $('.modal-body'),
-		frame = $('iframe', body);
-	if (frame.length > 0) {
-		var win = frame[0].contentWindow || frame[0].contentDocument;
+	$('div[id^="dialogMonitorLesson"] iframe').each(function(){
+		var win = this.contentWindow || this.contentDocument;
 		if (win.resizeSequenceCanvas) {
+			var body = $(this).closest('.modal-body');
 			win.resizeSequenceCanvas(body.width(), body.height());
 		}
-	}
+	});
 }
 
 
@@ -613,5 +615,4 @@
 			});
 		}
 	}
-}
-
+}
\ No newline at end of file