Hi. I'm sorry if this is again a stupid question.... But we bought an Airport Extreme router today. I have a new iMac and I 'thought' I loaded up the N software when it came out a few months ago. Though I'm wondering why I would've done that if we didn't have an N router. Can someone tell me how I can tell on my iMac if I am running on "N" now vs. G? The Airport Extreme is working but I want to see which version I'm running and if I need to download the N firmware update. Thanks!