Lost administrator password how to install a fresh OS?

Basically I have lost my password for the computer so I can't even get into it. And I would like to install tiger into my ibook. Is there anyway I can get around this? I don't have the cd's that came with the computer since I have lost them. Thanks for any help.

restart hold command+s
type: /sbin/mount -uaw
type: rm /var/db/.applesetudone
type: reboot
now a setup start create an another admin account with different shortname from the previous.
you have new admin account, new passowrd and data are safe.

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