Leopard trouble installing

[valiechemicalie]

Trying to install leopard on a Imac G5 1.83
after i insert the dvd and press restart I hold the c key
then after a while a image appears of a folder with a binking question mark and an image of he osx finder

what am i doing wrong?

 

[Bennieboy©]

restart holding the option key, thats the Alt next to the apple key and it should bring the disc up as a bootable option