ok but how do I assign the static IPs from sbc to my computers that are behind the router?

Usually you don't; you assign the machines on the local network IPs from one of the private, non-routeable ranges like 10. or 192.168. and set the router up for NAT (Network Address Translation). The router will "learn" the IPs you assign to the LAN machines, and by setting up port forwarding as in chanto!'s example, will route both outgoing and incoming requests to the proper destination. The manuals that accompany most routers do a good job of describing how to set everything up, but if you have specific questions just tell us the model of router and we can walk you through it.

I know all that stuff for internal IPs.
earlier in the post I said I had port forwarding running and and everything worked. but I got the static IPs so I can have seperate IPs for 5 different computers. I want to be protected so they are not sitting ducks for hackers.
so I need to install firewalls on each? or put a router in for each after a hub?
so they are protected. I am not at these computers, they are at a remote location.

OK, if you want to specifically use the IPs that you've got and access the machines from the Net that way, I'd install a good software firewall on each of them. You might want to take a look at the Zone Alarm firewall packages from Zone Labs.