How do i boot a CD image off a Mac Apple?

my dad has gotten a new dell Notebook and he gave me his Mac iBook he hasn't used his iBook in about a year and completely forgot everything about it. he doesn't kno the password to log in. I went to the Apple Store and bought an OS X image *tiger edtion. We i turn it on i put the CD in and at just doesn't boot from it i don't kno wut i am doing wrong so if you can please help me i;d much appreciate it. and i am not a big fan of apples i am more into PC's. so i don't kno much in how to use a mac. please help me. thank you very much. oh and i also have windows vista ultimate and was wondering if i can put that instead of OS X tiger? but first i need to kno how to boot off of it. because i kno that in a regualar PC you either press F12 or Esc to go to the setup menu but i don't see that with the Mac.

Answers:
the key is 'C'.

reboot while holding down the c key... and it will boot from the cd/dvd.
I ebayed my Mac a few months ago and bought a cheap PC instead. Best decision I ever made!

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