How do I reset Tiger Mac OS X 10.4 admin password by using single-user mode ?

I bought a used PowerBook G4 on Ebay. The administrator's password was locked. The Powerbook still can run to the normal screen. However, I am unable to update and install software without a password. I don't have the original install CD either the second mac for firmware reset. So I wonder if anyone... show more I bought a used PowerBook G4 on Ebay. The administrator's password was locked. The Powerbook still can run to the normal screen. However, I am unable to update and install software without a password.

I don't have the original install CD either the second mac for firmware reset. So I wonder if anyone knows how to reset the password by using single user mode or any other methods to do so?

Any input will be greatly appreciate it. Thanks.
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