Accidentally re formatted PC partitioned hard drive. now can't use.

Upgraded to Leopard. Installed boot camp. Runs PC side well. Accidentally re formatted PC partitioned internal hard drive (thought I was formatting an external back up hard drive). Now Windows XP gone and re installed Mac side too small to back up. Would like to combine hard drives to original Mac mini and start over. How do I do that? (I have Mac backed up on external drive from Time Machine and Windows as well as I can).

Run the Mac OS X install DVD, go to disk utility and delete the PC partition. Then Resize the existing Partition to fill the free space.
You don't have to re-install OS X if you don't want to, Leopard's disk utility has non-destructive resizing.
You can also try to perform this action from within the OS, although I've had a few problems with resizing before and find it works best straight off the DVD.
Good Luck!

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