How can i connect my computer to the internet through a wireless router?

I have a computer that is connected to the internet that has a broadband modem and has a usb wireless router. How can i connect my other computer Everex that's running on windows XP to the internet using the wireless router from the computer that does have Internet?How can i connect my computer to the internet through a wireless router?
Your other computer needs a wireless card in it. If everything is hooked up right. Your computer should detect the wireless signal. Good luck!