By using ICS you could do such a thing. Here's an example. http://www.microsoft.com/windowsxp/using/networking/expert/bowman_02april08.mspx
But be aware I will not answer queries about how to do this or give any "step by step." Here's why. Because this is advanced networking you must understand what you are doing or else it will break and cause too much grief for all involved.
But it is possible.
Ok I have a wmp54g adapter card in my computer and am recieving internet. I also have a pci pro200 card in it, can I hard wire my ps2 to the pci pro200 and some how get to the wireless card to get internet for the ps2?