How do I boot from an external drive?

I've just Carbon Cloned my 60GB drive to a firewire external drive. I'm about to replace the 60GB with a 160GB drive and the CCC instructions say boot from the external drive I'd just created once the new disk is installed. Then CCC the cloned drive back to the new hard drive.
So, how do I boot from an external drive? Do I have load anything to the new drive? Will the macbook detect the external drive and boot from that? Or what??????
Thanks
Dick

Thanks DWB. Being the rash impetuous guy I am I didn't wait for replies and just switched on the macbook after installing the new disk (which was so easy it was unbelievable - had to go and buy a a little torx bit though) to see what would happen.
Blow me down with a feather if it didn't just boot off the external drive all by itself :-O It did come up with the disk was unverified and I could see it in FINDER and I was prseented with a screen to ERASE/RESTORE etc.
When I went to CCC the external drive back to the new hard drive it didn't give show me the new hard drive so I guessed I'd have to do something to format (?) the hard drive.
I don't know if I did the right thing but I went to disk utilities and chose ERASE in the vague hope it would maybe format the disk in some way.
Seems to work now and the CCC replaced the system perfectly as far as I can see.
Basically very impressive all round. Piece of proverbial to replace the disk and CCC made life so easy.
Thanks again.
Cheers
Dick

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jamesfromcanogapark wrote:
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You need a Firewire optical drive to boot, and an AGP PowerMac G4 at that to boot Mac OS X. To identify your PowerMac G4, see this article:
http://docs.info.apple.com/article.html?artnum=58418
Once you've identified it, boot the machine into Mac OS 9 on the hard drive and make sure your firmware is up to date:
http://docs.info.apple.com/article.html?artnum=86117
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http://www.macmaps.com/upgradefaq.html
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Original Information
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How do I boot from an external drive?

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