file permissions

[Guillermo]

Hello,

    I am new to Samba and to this list and I have a question to make:
    Is there any way to allow users write in a public directory shared
with Samba and, at the same time, deny the removal of any file in the
same directory. This users have not an account in the Linux side so they
log as the guest user.

   I am using Red Hat Linux 5.2 and Samba 1.9.18p10.

            Thanks everybody