PHP Including a folder

[SiKing]

Hey, I have a website and a seperate folder within which is a PHPbb forum. However, I want to include the forum into the main site so that I have the header and footer of the original site rather than the forum. Sorry, may have worded that in a very difficult way. Please can anybody suggest how this is done? Thanks


EDIT:: I'm currently using an Iframe for now but the height of it doesn't change so it looks tacky but hey