Problems Setting Up Wireless Card

Hello:
I'm using opensuse 10.3 on DELL Vostro 1500 laptop.

I'm experimenting some problems setting up my wireless card. I use a "Broadcom Corporation BCM4328 802.11a/b/g/n (rev 03)" with ndiswrapper, the latest version. The thing occurs when I try to set the ap or essid using iwconfig command. I always type the following command:

 iwconfig wlan0 essid mywifi

or else (with quotes)

 iwconfig wlan0 essid "mywifi"

. It never works.

Using google I found some partial solution. I set the mode to ad-hoc and then I execute again the same command. It apparently work but when I set it again to managed mode the card "lost" the configuration.

Another rare behavior: I make it work with the knetworkmanager but I can't use it for security reasons. It also works setting the essid with wpa_supplicant

wpa_supplicant -Dwext -iwlan0 -c /etc/wpa_supplicant.conf

but manually never works!

I really need some help and sorry for my bad english

Why not just configure the Packman repository and install the broadcom driver? bcm43xx-3.130.20.0-2

Because i think that this situation is not a driver problem. I can't explain myself how knetworkmanager can do it without problems. it obviously works. :S