protection for deleteing files

[ildi]

I am using a samba server. It goes very fine, only one problem. All my users can see the content of the directory, so they can delete my files. They must to have the right to read and write in the files, but not to erase them. I tried to find a way not to show the content of the directory, a possibility from the mashine or server, but no solution.
Please help me !
ildi

 

[jaymzter]

the only way i know to this are with hidden files and the 'hide dot files = yes' option in smb.conf