Password Trouble!!!

Hi everyone,
my second post on here, got a problem.
My Mac G4 Quicksilver is passworded and i need to install OSX Tiger on it. I can't do this because I havnt a clue what the password is, everytime i insert the Tiger DVD it says i need to reboot, so i click this and then it asks me for an authentification password. I dont need any of the data on the drive so a full format is not out of the question, so any instructions on doing this would be good too. Is there any way to bypass the password, i dont want to replace the HD because it was expensive and is a genuine apple 120GB.
I trust i will get some help on this one, this forum seems to be one of the best.
Many thanks.
Max

From your post, it isn't clear if you already tried this, Mac OS X: Changing or resetting an account password...

Ive just checked it but i found the answer on the help viewer installed on is OS. Had a few problems with getting it too boot without asking me for a password but everything seems ok now.
cheers