Just to clarify what you're trying to do, you have a wireless connection on your computer connecting it to the Internet via a wireless router or access point and you want to connect the wired network interface of this same computer to a switch that you will connect your other computers to, correct? It would also be helpful to know what OS you're using. If that's the case, all you have to do is share the Internet connection on your wireless interface. Assuming you're using Windows XP, to do this, right click on your wireless network connection and select Properties. Go to the Advanced tab and check the box under Internet Connection Sharing. Then select your wired connection in the drop down box. This will set your wired LAN connection to a fixed IP address of 192.168.0.1 and enable DHCP to provide your other computers with an IP address. You'll have to set your other computers to automatically acquire an IP address. Let me know if this works for you.
