Map Transitions

[Chilton]

Before i begin, this may have already been stated somewere, but the search tool yielded far far far too many results when i searched for it, so i apologise if this has been stated.

My question is, how to you make an Area Script or somesuch thing to move you to another map? Or more accurately, what should the script look like?
I tried using an entity callback, but either i did something wrong, or the engine doesnt like callbacks leading to functions...

Any aid is much appreciated