[Samba] samba as pdc pam authentication with postgres databse

[prasanna]

dear friends,
             My problem is ...
              i configured samba as primary domain controller. it
successfully working in windows 98 clients... 
then i tried to configure the samba(pdc) to authenticate through PAM
authentication with postgres database. but it fails.. i installed pam
postgres module sucessfully

how to configure samba(pdc) as PAM authentication.. is it possible. when
i searched in search engine i dont get proper answer

please help 

regards

prasanna