configure your wireless device through the network manager as usual so you can start it normally once logged in. Make sure Connection automatically and Available to all users is selected.
edit your /etc/init.d/network file and change the line "chkconfig: - 24 90", basically you need network to start after NetworkManager
run "chkconfig --del network", then "chkconfig --add network" (to reset the start order). then "chkconfig network on"
