Installing 10.2 on 10.4 machine

[ahoesch]

Hi all,

we have an old PowerMac thet ran MacOSX 10.2 for years. We recently 
installed 10.4 but need to downgrade this machine again for special 
reasons. I inserted the install DVD and pressed c while the computer was 
restarted, but the machine refuses to boot from the 10.2 install dvd. 
What do I have to do to get this to work?

Any idea?

Thanks a lot,

  Andreas