Hello Rechard,
Same thing, just use the IP address instead of the "interface" keyword.
static (inside,outside) tcp 203.10.1.2 80 192.168.1.3 80
access-list outside_acl permit tcp any host 203.10.1.2 eq 80
Check my blog at http:laguiadelnetworking.com for further information.
Cheers,
Julio Carvajal Segura