[Samba] Join samba to existing Windows domain

[Jeffrey]

Hi,

I am running samba 3.0.14a on FreeBSD 6 box. I need this box to join to 
existing Windows 2003 domain to act as a file server to serve Windows XP 
clients. In the book "using samba" says to use "smbpasswd -j ..." to join 
the domain. But the -j option seems didn't existing. Anyone would be able to 
tell me what is the best way to make samba to join the domain?

Thanks,

Jeffrey