howto switch between wlan's?

[sean darcy]

I have two wireless networks. I'd like to be able to switch between 
them. I'm using ndiswrapper on f8 with a Broadcom BCM94311MCG chip.

ifcfg-wlan0 works fine:

cat ifcfg-wlan0
DEVICE=wlan0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Wireless
ESSID=net1

So I set up ifcfg-wlan1:

     cat ifcfg-wlan1
DEVICE=wlan0
BOOTPROTO=dhcp
ONBOOT=no
TYPE=Wireless
ESSID=net2

   ifdown wlan0
   ifup wlan1
Determining IP information for wlan0... failed; no link present.  Check 
cable?

Then:

    ifup wlan0
Determining IP information for wlan0... failed; no link present.  Check 
cable?

rmmod, and modprobing ndiswrapper makes ifup wlan0 work again.

I can see both wireless access points with iwlist wlan0 scan.

sean