PHP Issues

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Okay, work on the website is going to screech to a halt until I can figure this issue out. I have some main pages that I use for formatting and things of that nature, and I've got them in the main directory. An issue I'm having is I can't go into sub-directories and call these main pages because my document root isn't set to the main directory where all my stuff is.

Example: http://homeworldsource.net/test/

This is my sad face.

Also, if anyone knows anything about PHP and this DOCUMENT_ROOT var, let me in on the secrets lol.