* event handler for checking and processing user input and
* for defining navigation
  TRANSLATE:
    wa1-cityfrom TO UPPER CASE,
    wa1-cityto   TO UPPER CASE.
  CASE event_id.
    WHEN 'find'.
      navigation->set_parameter( 'wa1' ).
      navigation->goto_page( 'flights.htm' ) .
    WHEN 'exit'.
      navigation->exit( 'http://www.fh-augsburg.de' ).
  ENDCASE.