Sure, just use port redirection with your statics.
> static (inside,outside) tcp 200.1.1.1 80 10.1.1.1 80 netmask 255.255.255.0
> static (inside,outside) tcp 200.1.1.2 80 10.1.1.2 80 netmask 255.255.255.0
> access-list inbound permit tcp any host 200.1.1.1 eq www
> access-list inbound permit tcp any host 200.1.1.2 eq www
> access-group inbound in interface outside
where 200.1.1.1 and 200.1.1.2 are the two external IP addresses, and 10.1.1.1 and 10.1.1.2 are the two internal hosts that they map to. You'll obviously have to get these external addresses assigned to you by your ISP and have them routed to your PIX.
Keep in mind that you can't do something like:
> static (inside,outside) tcp 200.1.1.1 80 10.1.1.1 80 netmask 255.255.255.0
> static (inside,outside) tcp 200.1.1.2 80 10.1.1.1 80 netmask 255.255.255.0
where two outside addresses are mapped to one internal address (or vice versa), but as long as each port redirection (for the same port number) goes to a different host then you'll be OK.
