Printing to a Windows shared printer via SAMBA

I'm trying to setup my mac to print to a printer shared via a Windows PC on my network. I have gone into system preferences / print&fax and added a printer, used the "Advanced" settings on the toolbar, chosen SAMBA and entered the address of the printer as smb://IPADDRESS/printername

When I try to print to this printer, it asks for a username and password. I enter it and then the document briefly appears in the printer queue and then disappears as if it has printed successfully. The document however never appears in my Windows printer queue or actually prints.

CUPS does not return any errors in the CUPS log file. CUPS actually says the printer is idle and accepting jobs.

A friend can print from a windows PC to the printer by using the address \\IPADDRESS\printer name in the manual windows printer setup (the printer does not show up in the browser).

I can also connect to the computer using Leopard's built in SAMBA networking by accessing smb://IPADDRESS so I know the server is active on the network and my username and password work.

Does anybody have any ideas why I am not getting an errors and it's still not working?