sorry for my bad english but here the solution:
- remove the wlan-card
- load an firmware from http://www.prism54.org
- copy this file to /usr/lib/hotplug/firmware (mkdir firmware if doesnt exist)
- rename it (for Netgear WG511) to isl3890
- insert the card
- if after the insert some errors are displayed on console load an older firmware an rename it like shown above
- if no errors displayed try iwconfig on the console as root to configure the wlan-card (try man iwconfig for more details)
- set the card with ifconfig eth1 up online
- eventually start dhclient to get dynamic ip from a dhcp-server/accesspoint