Booting Kubuntu from CD on a PowerMac G4?

[Graham]

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I have recently been bequeathed an Apple Mac G4 running OSX Tiger.  The
machine seems to boot directly from the hard drive and I can't find out
to go directly into the BIOS at boot up to make the CD/DVD drive be the
first called.

I'd like to get Kubuntu Edgy running on it and I've downloaded the
powerpc version to install, but I can't find out how to get into the
BIOS to get the CD/DVD drive called first.

Can anyone help me or direct me to a howto?

- -- 

Graham
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