Essentially what I want to happen is that when you hit New Game, before ANYTHING else happens it pops up a messagebox asking you whether you want to play Campaign or my special game mode, and if you choose the special game mode it teleports you to a specific cell and opens up the showracemenu.

My question is:

Where do I place the script commands to pop the messagebox?
I'm guessing just at the beginning of stage 0 of MQ101?

I know Arthmoor would know...