Displays system messages in fully themeable colored horizontal bars on top of the page, similar to Stack Overflow / Stack Exchange network notifications.
Features
when messages are displayed content is pushed down respectively, so that nothing is covered and everything could be still interacted with,
alternatively, messages could be fixed to the top of the browser's viewport, so they will always remain visible regardless of scrolling,
each message has its own "Dismiss" (close) icon,
optional "Dismiss all" icon is displayed if total number of messages exceeds value defined in module settings,
messages could be dismissed automatically after a specific time - configurable in module settings for each message type separately,
hovering mouse cursor over messages resets dismiss timer,
provides option to re-show all already dismissed messages,
provides option to display only first n lines of each message, with remaining part shown after clicking on the message,
provides separate permissions to administer and to access Absolute messages,
full control over output with template files,
uses standard jQuery library without other modules or plugins dependencies,
falls back to standard Drupal's way of displaying messages when JS is not available (or when user does not have access absolute messages permission granted),
provides option to skip "has_js" cookie checking, which disables fallback to standard Drupal messages if no JS has been detected (for example in case of Pressflow, which dropped "has_js" cookie completely),
displays devel messages as standard Drupal messages.
Hooks
hook_messages_alter($messages)- allows other modules to update messages before they are displayed,hook_message_types_alter($message_types)- allows other modules to add new messages types in addition to default ones used by Drupal (status, warning and error) - useful for setting message automatic dismiss time in module configuration.