I dont know if this will help you or not, but if all the machines are running windows xp or newer you can mount ftp directories as virtual drives (this may be possible in mac os x too, i just dont know how). Try creating an ftp account on your web server and give it access to a new directory. Give it a username and password that all the people you want to share with have access to.
Read instructions about mounting an FTP folder/account as a virtual drive:
I hope this helps.