Admin password reset

[John Golitsis]

Sorry folks, I'm sure this question has been asked and answered a  
million times, so if someone can simply point me in the right  
direction, it would be much appreciated.

We have a Mac notebook computer that a previous employee used to use  
and he's refusing to give us the admin password to Yellow Dog.  Is  
there a way to reset this?  There is info we need on this machine, so  
we can't simply reformat and re-install.