You can look over
this wiki link about 102.11 wireless LAN (WLAN) for more information, but here is the low down.
Camera frequency channel A is just below WLAN channel 1, so if you use Channel A, stay above WLAN channel 2 (any channel from 3 - 14).
Camera frequency channel B is between WLAN channels 5 and 6, so if you use Channel B, stay below WLAN channel 4 or above channel 7.
Camera frequency channel C is between WLAN channels 9 and 10, so if you use Channel C, stay below WLAN channel 7 or above channel 12.
Camera frequency channel D is just above WLAN channel 13, so if you use Channel D, stay below WLAN channel 12 (any channel from 1 - 11).
Your router may not show all of the channels. Many of the US standard wirless LAN routers only go to channel 11. The closer you get the camera frequency to the WLAN frequency, the more chance you have for bleed over that will degrade one or both signals. Since the US does not typically use channels above 11, your safest bet is to put your cameras on Channel D and use a channel 9 or below for your WLAN.
Look at the link I posted above and look at the chart under "Channels and international compatibility".
Hope that helps