samba - Sep 2003 - Samba share with read access to some and all rights to others

Hi
 
I have a RH 9.0 box running the latest stable version of Samba, it runs as a
PDC; DHCP etc. I've just run into a little problem I can't seem to work
my way around of. We have a share on the server which is supposed to be readable
to some while others are supposed to have full access right to it. How am I
supposed to set this up and what kind of rights should the folders have?
 
Regards
Roy