How to restore an iBook G4 to factory settings?

I know that you can restore an iBook G4 with this one disc but is there any other way to restore the laptop without the disc? I currently do not have the disc needed. My sister gave me her old iBook G4 recently. She has tons and tons of old pictures and documents still on it and I would hate to bug my mom right now about getting a disc at the apple store to restore it. So if there is any way to restore it to its factory settings without the disc then please tell me how! Thanks!