Wireless Internet Question

I have a wireless internet network in our house. It consists of a wireless router connected directly to my cable modem. What I need is to be able to connect a laptop in our office to the internet. For security reasons this laptop was purchased by an employer without wireless network card or capabilities. Does anybody know a way to take the wireless connection, receive it and then put out internet via ethernet to another computer? Or am I stuck with using this laptop only in the living room where the wireless router is located?