OK, I tried out easyurpmi, but there is like a little problem : no wifi = no internet for me... But thanks a lot, it'll be very useful in the future. I googled for many things like "rpm finder" etc, and tried out 2 of them :
None of these gave me wireless extensions, but always wireless tools. Of course I installed the 28, which I found one pbone.net. I then re-installed the drivers with ndiswrapper, but I still get the recommendation.
For the wireless extensions, I only found a *.diff file, with which I don't know what to do.