Apple has a guide on resetting the administrator password here: http://docs.info.apple.com/article.html?path=mac/10.4/en/mh655.html This one is for OS X 10.4 (Tiger) but the method is the same for newer versions. In older versions the only difference is that the reset password option mentioned in step 3 is located in the installer menu instead of the utilities menu.
To change the administrator password, you must know the current administrator password. If you're logged in as the administrator, open Account preferences and click the Change Password button.
If you don't remember the password and automatic login is turned off, you can reset the administrator password using the Mac OS X User Install disc.
IMPORTANT: Because a user with the Mac OS X install disc can gain unrestricted access to your computer, you should keep the disc in a safe place.
To reset the administrator password using the Mac OS X disc:
Be sure to change your login password in Keychain Access to match your new password.
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