Time Machine backup to a HD on another Mac on my network?

_The short story_:
I want my MacBook Pro Time Machine backup drive to be one connected to my G5. The MacBook and G5 are connected via my wired network. I have file sharing turned on and can access it, with read and write permissions, but Time Machine can't find it. How do I browse for it and select it?
_The Long story_:
I was out of town for 8 months, during which time I bought a MacBook Pro (OS 10.6.2). I also purchased an OWC 1.5TB HD which I connected directly to the MacBook via Firewire 800 and used it for Time Machine backups. Cake.
Now I am home, where my trusty old G5 resides. The G5 is at OS 10.5.8. The MacBook and G5 are both on my wired network.
I connected the new OWC 1.5TB drive to the G5 via Firewire 800. I can see this drive from my MacBook via file sharing, can read and write to it, etc, but when I go to "Select Backup Disk" in Time Machine on the MacBook, no drives show up. If I right-click on the Time Machine icon and select "Browse Other Time Machine Disks", there is nothing there either.
Essentially, I just need to find that same drive which is now connected to another networked Mac.
The only user account I have on each machine is just a single Admin account. Does it have something to do with creating a new account on the G5?
Since the drive in question is connected to the G5, it seems like the G5 is the gateway (for lack of a better term) for my MacBook to get to that drive. I just don't know how to make that happen, since when browsing in Time Machine for backup drives, you can't select a networked computer and then drill down to a specific drive.

I was hoping to find a way to automatically mount the OWC drive on the desktop of my MacBook, so on the MacBook I selected "Go" in Finder and chose "Connect to Server". I selected my G5 and was then able to drill down to the OWC drive. That brought up a Finder window that allowed me to access everything on the G5. I guess that is just basic file sharing via my network.
I had a feeling that would allow Time Machine on the MacBook to use that drive, and it did. However, when I selected "Back Up Now", it appears to create a new backup, not just the usual incremental backup that you get after the first time you use Time Machine.
I am closer, but clearly don't have the full solution. I was hoping Time Machine would see that drive as the same one it had been using (since it is), but obviously it wants to start a backup from scratch, so to speak.
Ideas?

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