I just purchased a Linksys wireles-g router that I installed on my desktop pc. I want to use my laptop to get online without having to use an ethernet cable so won't I have to install a wireless notebook card on my laptop too? The router model is WRT54G, 2.4GHz, 802.11g. I think I need the Wireless-G Notebood Adapter, Model # WPC54G. I just want to be sure of everything I need to go wireless.