Does anybody know how to set up a map so it displays a certain message on the loading screen of one mode, and a different message for another mode? I'd like to set up a map's loading screens to work in a similar way to the shipped campaign maps - in campaign mode it displays a single mission briefing message, while in conquest mode it displays the various tips and tricks type of messages.

I know the localizations for the campaign mission briefings are stored under 'ifs.briefing', but I'm not sure how to tell the map to read the message from here instead of 'level.common.tips'.