Why can't I install Leopard on my G5 iMac?

I have a G5 PPC iMac running Tiger and I've just bought an Intel iMac running Leopard. I'd like to bring the old PPC machine up to Leopard but, when I try to install it, I get a message saying that "this software cannot run on this machine".
Why does this happen? Are the disks Intel specific? If so, what are my upgrade options?
Intestinal

Hi Admiral Duck: Yes indeed, the disk that ships with a new computer are machine specific. To upgrade you will need a retail version of Leopard.
Help this helps
Stedman

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Why can't I install Leopard on my G5 iMac?

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