OK i got Ubuntu 8.10 and Windows xp as a dualboot system. How do i now install mac osx and have a tripleboot?
BEcause if i install i it will rewrite the MBR or?
Thx in advance.

I HAVE NEVER DONE THIS, but Easy BCD has the ability to write Linux and Mac boots into the MBR. My guess would be to install OSX, get it going, put the Vista/W7 DVD in and have it repair your windows install, and then use Easy BCD in Windows to add a boot for the mac and Linux OS's. I HAVE NEVER DONE THIS SO SEARCH TO MAKE SURE.

Is there no other way like in Linux just install it as adualboot option with windows and ubuntu. Ubuntu let's you choose how to boot is there no setup for that. It would bbothersome. I will check in an ubuntu forum. Thx so far.