Multiple Servers Behind One Router

[Hotwire]

Here is my setup

Router---------XP Computer
|
|
Switch
|||
|||
||L____Server 1
||
|L_____Server 2
|
L______Server 3

All 3 servers are running ISPConfig. 2 are running FC4 one is running FC3.

All the servers host seperate domains.

But I can only get one server at a time to be accessable from the net. I have IPtables setup on my WRT54G. Is there somthing Im doing wrong? I want all 3 to be accessable from the net, all of the services use there usual ports (Apache uses 80 and so on) on all 3 servers.

I need the right domain request to be sent to the right server.

[Ben]

That's is impossible until you have 3official IPs on the router, whcihyou can forward to each server, or you do a portnat, e.g. 80 to server1, 82 to server2 and so on...
But it looks like an ugly construct anyway.... is there no way to consolidate the three servers to one?