Notification System
The notification system on Helioviewer.org is used to notify users about events that have occurred during use of the application. Examples are notifying the user when a screenshot or movie is generated. Another example is when a user visits helioviewer.org for the first time, a notification appears asking them if they would like to start the interactive tutorial.
The plugin jGrowl is to display notifications
jGrowl is wrapped with a Message Console interface which can be used to display messages.
An instance of this interface exists at helioviewer.messageConsole which can be accessed anywhere in the application.
See the Message Console Class for more details.