I have a linux (redhat 6.1) server running samba (not sure what version, but can be updated if necessary).  
I have some windows 98 users connecting the the samba share.
I would like to restrict user access in a specific way...
I want to allow them to create and edit files but not allow them to delete or move any files (that is, I don't want them to be able to delete or move files they have created).
I have heard this is possible in windows 2k/xp and figured
it must be possible in the linux arena as well.
I have tried making the parent directory the files are in r/w but non executable and the files themselves r/w, which allows them to modify files, but as well as not allowing them to delete they cannot create files either.
Is what I want to do even possible in linux?

thanks,

j