The above link has discussion based on people who have done what you want.
Also see these links:
The other possibility is that most routers have an uplink port which is usually the first wired port (port 1). You may be able to connect a standard RJ45 cable between the two routers. This is true of wired routers connecting this way to a wireless router. I have done this myself connecting a netgear wired router to a D-Link wireless router which has 4 wired ports.
I am not sure whether doing this where both routers are wireless will work or not.
☺ When everything else fails, read the instructions.