Ooops, sorry a little bit of hurry, check this one:
ip nat inside source list 101 interface FastEthernet0/0 overload
ip nat inside source static tcp 192.168.0.XXX 21 66.56.196.6 21 extendable
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
no ip http server
!
access-list 101 permit ip 192.168.0.0 0.0.0.255 any
access-list 112 permit tcp any host 66.56.196.6 eq ftp