OK, since nobody giving any hints I'll put up a idea or two.
I was watching the Youtube video(for the guy whose name has escaped me) and noticed that his boot manager is Windows Boot manager. As this is only on Vista or Windows 7, this is a no go option (unless somebody suggests otherwise).
So, first of all I thought about using XP's own boot manager -
Wellfirstly, I can'tfind anyone that has done this, so this could be a learing curve. Or me messing with the boot.ini could have some problems.
So there's option two -
Anyone familier with Linux should be used to this, and there is support out for it. Again, the people using it with OS X is limited so this may not work or be a bit complicated. And I'll need a seprate partision for it. SO this also has downsides.
SO, again and ideas, guides, tips or warnings would be appriciated