WLAN and no chance to get online with linux

Hi there,

I have a SuSE 9.3 linux on my Notebook and managed to go online with
some other foreign (open) wlans. Also win XP on the same machine is no
problem and I can go online there.
The problem is now, that I have no chance to go online in my home wlan
using SuSE linux 9.3.
The device is recognized correctly and configured with YAST2, even
kinternet shows the "current connection" (under "wireless
connection...") properly as my other PC running SuSE as well. Only
difference is that my notebook doesn't show any network in the neighbour
tab called "search wireles networks..." (or similar), where I normally
would select the network and click on "Connect".
If I click on "check connection..." (or so, in German "Verbindung
prüfen...") in the menu of kinternet, it says below "standard route ok.
.... nameserver ok.". I really don't know where the problem is...
konqueror doesn't want to go online...

Device is a Compaq WL100 pcmcia card, notebook an older sony vaio, no
special drivers used for the card, WEP 128bit and the shared key is
correct. Router is a WRT54G running with the Alchemy firmware V1.0
v3.37.6.8sv.

Any help is very welcome!
cheers,
Matthias