Hey, Im completely new to the OSX scene.

I would like to install OSX on my spare 50GB partition on my HDD.
So far I have dual booted XP and Ubuntu using the Ubuntu GRUB Bootloader.

Im on an AMD Phenom II x4 CPU with ATI Radeon HD 4800 Series graphics card. (ask if you need further specs)

I would like to install OSX (Leopard or Snow leopard) and triple boot it with my XP and Ubuntu. However, since im completely new to the OSX scene I have no idea how to go about this :/

I understand that OSX isnt normally compatible with AMD or ATI but you can get it working?

Please could someone direct my to a download of an installer DVD image and instructions on how to install it?

Also, could someone inform me how to edit the GRUB Bootloader, or, could someone inform me how to scrap the GRUB Bootloader and use another one in order to Triple boot XP, Ubuntu and OSX.

Thanks alot in advance,
Gavin