[masraum]

How do you currently connect to the net? DSL, Cable, dialup? If it's DSL or Cable then you just want what the guys have already mentioned. If it's DSL or cable then you probably already have the network connection plugged an ethernet port. Since you said you don't have an ethernet port that has me wondering. If you are using dialup then you'll only really need a wireless car for the PC and laptop and can just talk between the two and share your dialup on the main PC. If you have cable/DSL then you probably won't need a wireless card for the main PC, you can just plug it in to the router since most have wired and wireless ports

Let us know more about how you connect to the net for more specific info.