Is there a way to securely erase the drive during a fresh install

I'm selling my iMac G5 and Powerbook G4 so I can afford a brand new Intel iMac (the 2.8GHz one). I have Leopard running on both these machines at the moment, but on the iMac G5, I want to restore it to factory settings using the original Tiger install discs (I've lost the ones for the laptop).
I would like to ensure that these computers don't have any personal data on them before they leave... is there a way to completely scrub the drives before performing a reinstall? My only other option at present is to reinstall, then use Disk Utility to securely erase all free space... but I can't remember if that option was available in Tiger.
Perhaps there's some even better way I can prepare these machines for a new user that I haven't thought of?

Ok, I found the best way to ensure that all your personal data is gone before you sell your Mac is as follows:
1. Perform a reinstall of OS X (selecting erase and install)
2. When install has completed, create a quick test account so you can log in
3. Run Disk Utility and erase all free space to the required level (I chose 7 times overwrite)
4. Perform a reinstall of OS X (selecting erase and install) and power the machine off afterwards (when you get the first setup screen.
My reasoning is that after the first fresh install, you only have OS X's files on the filesystem. Any personal data that hasn't been overwritten is in the free disk space. Disk Utility then clears that up and the second fresh install allows you to get the machine to the state you normally get a brand new Mac in (i.e. prompts you for initial setup information).

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