is it possible to install macosx on an insprion 1520 that already has linux and windows xp installed on it? maybe install macosx on top of this to create a triple boot? i don't want to install macosx on an external hard drive but on the same internal drive that store linux and windows xp. i am using grub 2 currently. is this possible? please help a noob out!

i've searched and asked on insanely mac but they've been of no help. they say to do a fresh install but how do i do this without having to do a fresh install?