Function: Handles the AJAX pagination for the admin courses navigation.

Function: Handles the AJAX pagination for the courses navigation.

Function: Handles the AJAX pagination for the courses registered.

Function: Handles the AJAX pagination for the course progress.

Function: Handles the AJAX pagination for the quiz progress.

Function: Verifies the attributes for AJAX pagination.

Function: Adds the content to the course navigation meta box for admin.

Function: Gets the course info HTML output for user.

Function: Outputs the course navigation template for widget.

Function: Outputs the course navigation admin template for the widget.