Triple Boot Help Please

[thechungster]

Hey, I'm typically a noob at linux at the moment.
So, I'm on MacOSX 10.5.5. And I'm using VMware Fusion to boot Ubuntu 8.04. I'm trying to boot Linux via this guide.
Triple Boot via BootCamp - OnMac.net Wiki
But thing is, I already have my windows partioned and I have no idea what to do to partion my existing MacHDD so it will be partioned.

Ok, my current Harddrive stats are.
MacHDD: 125.88GB
Windows: 22.86GB (NTFS)

This is what I get with diskutil

#:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *149.1 Gi   disk0
   1:                        EFI                         200.0 Mi   disk0s1
   2:                  Apple_HFS Macintosh HD            125.9 Gi   disk0s2
   3:       Microsoft Basic Data                         22.9 Gi    disk0s3

What I really want is the command to partion my HDD. This is the command the website gives.

sudo diskutil resizeVolume [disk identifier] [disk size] [partition type] ["Partition label"] [partition size] [partition type] ["Partition label"] [partition size]

I'm slightly confused at the moment and help is greatly appreciated

Oh yeah, I forgot, I want my partion for Linux Ubuntu to be 10GB

[bjlock]

you gotta format, your partition

[Gitykins]

Boot into Windows, install Ubuntu INSIDE Windows.

Much easier, no paritioning. Only thing is, you can't edit the size after creating.

[ipodtouch1234]

be sure to back everything up... just in case.