If you want a wireless card for the lappy that offers full compatibility with the Linksys WRT54GS (speedbooster) router linked to earlier then get a Speedbooster enabled Linksys card
http://www.ebuyer.com/product/63761
However, you do only need a wireless card for the lappy if it doesn't already have wireless built in. Most lappys made in the last 2-3years would have wireless.