[Samba] samba, ldap changing password

[empirium]

HEllo
I have a samba 3 with ldap working as a PDC,my mail server also using 
LDAP database as a authentication.
Do you know any web application, script  (working with apache) that 
allow users to change their ldap passwords (smaba passwords and passwd 
passwords).
Usually users can do that from windows clients which log in to domain, 
but I have also a lot of users using laptops and they dont log in to domain.
Thanks in advance
luk