So I went back to the shop and got myself a SMC 2.4GHz 54Mbps Wireless Cardbus Adapter (SMC2835W V2 EU). Using this little card, which is supported by prism54.org I got my wireless network perfectly up and running with wep encryption up to 256bits. This shows you how carefull you have to be when buying hardware for Linux. Even though that previous card was perfectly allright when using window$, linux was a bit reluctant on this part. If only everything was opensource. That really would make life a lot easier.