I used this from Faq...

mount -t smbfs -o username=foo,password=bar //windowsbox/sharename /mnt/myshare <--- This only works if you have the username local to that machine -
WHAT IF I want to use a Domain ID???
'mount -t smbfs -o username=DOMAIN\foo,password=bar //windowsbox/sharename /mnt/myshare' <--- the DOMAIN\username does not work - how do I authenticate to this server without being part of the domain - you can do this in Windows NT based machine as long as you provide DOMAIN\USERNAME and Password combo