Maybe there is an easier solution that it's worth to try...
I just did a search for "at76_usb" on
Software.openSUSE.org and it seems that the module is available in the
openSUSE:11.0/standard repo - that means that it suppose to be on the DVD and maybe it is not on the live CD.
Do a search in your yast software package manager for at76_usb - maybe it is not installed but you have it on the live cd. If it is not download the rpm suitable for your kernel type "default" or "pae" and try to install it.
Good luck.
P.S.
There was a guy around that was making ISO images for people with no internet connection with updates and media related packages (not sure if the dev packages were in or not) on the older forums but I did not see posts on this one.