wireless ICS question

good evening all. Got a question for the tech experts in the forum. I have a netgear wg111 v2 wireless USB connected to my desktop in order to recieve the free internet access from my local library here in downtown dallas. The desktop is hard wired to my Linksys BEFW11S4 wireless router (with 4 port wired switch). From the router, a second desktop and 2 laptops are wired to the small network and at any given time a few other laptops are wirelessly connected to it as well. when my desktop is online through the usb to the library, i must disable my wired NIC in order to access the internet. I would like to share the usb wireless internet access from the desktop through the router to all other computers on the network as well as retain the shared properties of the network simotainiously. can this be done, if so how? I am using straight through cables for all wired connections, and am running XP on ALL networked computers. I am assuming I am having IP address conflicts between the wireless and wired connections. under a comand prompt using ipconfig, her are my settings- with the wired NIC disabled and the wireless enabled (internet accessable on desktop only) IP Address 192.168.212.79, subnet mask 255.255.252.0, default gateway 192.168.212.2, DHCP server 1.1.1.1. with the wired NIC enable the ipconfig settings are 192.168.1.1, subnet mask 255.255.255.0, default gateway 192.168.1.1, and DHCP server 192.168.1.1. I figure I will have to manually change some setting but which ones? also will I have to use a crossover cable between main desktop and the router and connect it to the uplink port? please help as I am very confused. Thank you in advance for any help.