prism 2.5 chipset config. 4 ubuntu

Hi all.

I have acer travelmate 250 with internal wireless based on intersil
prism 2.5 chip

0000:02:05.0 Network controller: Intersil Corporation Prism 2.5 Wavelan
chipset (rev 01)

But my connection not function.

eth0 Link encap:Ethernet HWaddr 00:02:8A:D8:B7:97
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:11 Memory:e0500000-e0500fff

eth0 IEEE 802.11b ESSID:"my_home_wireless" Nickname:"Prism I"
Mode:Managed Access Point: None Bit Rate:2 Mb/s
Sensitivity:1/3
Retry min limit:8 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=0/92 Signal level=-68 dBm Noise level=-122 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

Can I do anything to up my wireless?
Regards

Ivan