[Samba] Windows users can create files but Linux users can not?

[Jacob Friis Larsen]

I have a Samba server running on a Fedora Core 1 Linux server, and my 
problem is that Windows users can create files but Linux users can not.

This is my smb.conf file:

[global]
         workgroup = IDG_DK
         server string = WebDev
         log file = /var/log/samba/%m.log
         max log size = 50

[jfl]
         path = /var/www/websites/jfl
         valid users = jfl
         read only = No


Thanks,
Jacob