Yeah, I'm super confused by this whole thread....
You have an iMac. It originally shipped with 10.1 (for which you have discs); you upgraded it to 10.3 somehow at some point, but you don't have those discs anymore.
You have a Macbook with 10.4, and you tried to copy its copy of Address Book onto the iMac, which won't work for multiple reasons (because that copy of Address Book needs 10.4 and because that copy of Address Book needs an Intel processor).
So now you don't have any install discs for 10.3? Because you sold them with another Mac (could not have been a Macbook)? Which of course also means you should not be running Tiger to begin with....
And you don't have a backup, I'm presuming, of the iMac's contents before you did this, either?
Then I think your major options are...
1) Assuming you actually have any legal reason to be running 10.3 to begin with (and didn't pirate / borrow it), get someone who has install discs for 10.3 to let you borrow them and use
Pacifist to re-install Address Book.
2) Have that person just give you a 10.3 / PPC copy of Address Book off their computer.
3) Buy your own copies of the 10.3 discs