wireless and ubuntu help

[Alvin Thompson]

hi,

i have my laptop's wireless up and running on ubuntu. i removed the 
'auto' lines from /etc/network/interfaces to avoid long timeouts if the 
network adapter aren't connected.

is there any way to configure it so that iff a network cable is plugged 
in at boot (eth0), it will automagically configure it, and if not try to 
configure wireless (wlan0) with WEP? i have tried ifplugd in the past, 
but i could only get it to automatically bring up eth0 at boot, not the 
wireless.

it seems with the latest update, eth0 comes up automatically, and some 
lines have been added to the 'interfaces' file:

mapping hotplug
         script grep
         map eth0

is there any way to use that get wireless working if eth0 is not plugged 
in? is there a better way?

thanks,
alvin