[Samba] Samba Postgres and Password sync

[webmaster at viitindia.org]

I am using samba 2.2.2 as PDC. We have developed some software which uses Postgresql as database server. Now I want samba to look username password etc from Postgresql or I want to keep copy of username,password in Postgres. 
I tried following but does not work.
smb.conf
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passwd program = /scripts/pass %u
unix password sync = Yes
passwd chat =  root*password* secret\n \
*new*password* %n\n *new*password* %n\n *NIS* %n\n *Done*
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Now /scripts/pass is
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yppasswd $1 
read pass
psql -h 172.16.0.13 -U postgres sync << EOF
postgrepass
delete from users where username='$1';
insert into users values('$1','$pass');
EOF
echo Done
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How should I do this ?

TIA
Shekhar

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