installing on PPC -> partitions

[altern]

hi

i am trying to install Ubuntu on a powerbook 12". When it come to 
creating the partitions i am not sure about what to do. I have no free 
space outside my mac drive. Same is true for an external HD i have. I am 
not sure how to resize the partitions to allow Ubuntu to install there.
Before i had SuSE + XP on the same computer and SuSE creates by default 
a partition on the empty area of the windows. Very easy to install this way.

Any suggestions? i am affraid i will loose the info on my hardrives as i 
dont know details about partitions, before I always used Partition Magin 
on XP.

thanks

-- 
enrike