My problem is that I can't set the w(rite) flag for group on a samba share

The directory is called images and looks like this on the server:

Code:
ls -al /media/store/media/images/
total 620
drwxrwxr-x 11 martin users    4096 2007-05-29 10:02 .
drwxr-xr-x  6 martin users    4096 2007-05-04 21:57 ..
drwxrwxr-x 12 martin users    4096 2006-12-11 21:50 2000
drwxrwxr-x  8 martin users    4096 2006-02-09 21:01 2001
drwxrwxr-x 13 martin users    4096 2006-02-09 21:01 2002
drwxrwxr-x 14 martin users    4096 2006-02-09 20:59 2003
drwxrwxr-x 13 martin users    4096 2006-02-09 21:01 2004
drwxrwxr-x 11 martin users    4096 2006-11-12 12:51 2005
drwxrwxr-x 12 martin users    4096 2006-12-12 22:25 2006
drwxrwxr-x  8 martin users    4096 2007-05-09 21:25 2007
drwxr-xr-x  2 martin martin   4096 2007-05-07 11:49 db bak
-rwxrwxr-x  1 martin martin 583680 2007-05-29 10:02 digikam3.db
and on the client it looks like this:

Code:
ls -al /media/smb/images
total 610
drwxr-xr-x 1 martin users   4096 2007-06-04 11:15 .
drwxr-xr-x 8 root   root       0 2007-06-04 11:11 ..
drwxr-xr-x 1 martin users   4096 2006-12-11 21:50 2000
drwxr-xr-x 1 martin users   4096 2006-02-09 21:01 2001
drwxr-xr-x 1 martin users   4096 2006-02-09 21:01 2002
drwxr-xr-x 1 martin users   4096 2006-02-09 20:59 2003
drwxr-xr-x 1 martin users   4096 2006-02-09 21:01 2004
drwxr-xr-x 1 martin users   4096 2006-11-12 12:51 2005
drwxr-xr-x 1 martin users   4096 2006-12-12 22:25 2006
drwxr-xr-x 1 martin users   4096 2007-05-09 21:25 2007
drwxr-xr-x 1 martin users   4096 2007-05-07 11:49 db bak
-rwxr-xr-x 1 martin users 583680 2007-05-29 10:02 digikam3.db
Thus the group has write permission on the server but not on the client. I have tried to set write permission on the client but that is not possible...
Code:
sudo chmod -R g+w /media/smb/images/
I do not get an error - it just does not happen...

my samba config is like this:

Code:
[global]
        workgroup = HINGEFARM
        security = SHARE
        hosts allow = 192.168.2.
[images]
        comment = Media file share
        path = /media/store/media/images
        force user = martin
        force group = users
        read only = No
        guest ok = Yes
        hosts allow = 192.168.2.0/24
        case sensitive = No
        strict locking = No
        writeable = Yes