samba - Oct 2003 - Making samba work on arbitrary TCP ports

Hi all,
         due to firewalling rules I need to make samba hence netbios 
work at different ports than standard. so intead of 137-140 I would need 
something like 937-940, which should work. What is the correct way of 
doing this? Is editing /etc/services enough, or must I add something to 
smb.conf? will the win2k clients correctly sense the port change or any 
registry changes needed there as well?
Many thanks!