how to create again eth0

[abdelkader belahcene <abelahcene@gmail.com>]

Hi,
on my machine (Desktop PC) I have 2 network card : wireless (rt61 802.11) and a wired card (BCM44). When I install debian 5.
The wired card is detected and logical name eth0 is assigned, while wireless is not assigned I install firmeware*  software to configure the card.  It is done in some way ( I used  mnetwork from mepis, it works fine).
Now the problem: eth0 disapears,  and no eth0 inteface found ??  ifconfig gives just wlan0.
Question1:
                    why there is no eth0, it was before configuration of wlan0 ?
                    How to active again eth0, or ho to create the logical eth0?
thanks a lot

best regards
bela