Look at an RJ45 wireless bridge:
That way you'll get better connectivity and security. The original Airport card will probably only give you WEP, and basic 64bit under 9.x at that.
http://www.amazon.com/VAP11G-Wireless-Dreambox-802-11B-Connector/dp/B005WN6X74
http://www.aliexpress.com/item/RJ45-Wireless-Bridge/380258141.html
That way you'll get better connectivity and security. The original Airport card will probably only give you WEP, and basic 64bit under 9.x at that.
http://www.amazon.com/VAP11G-Wireless-Dreambox-802-11B-Connector/dp/B005WN6X74
http://www.aliexpress.com/item/RJ45-Wireless-Bridge/380258141.html