An important point to note (and the source of some confusion) is that most Access Points cannot communicate with each other wirelessly. Generally, (and especially in the case of inexpensive consumer-grade products) APs communicate only with wireless clients. This means that you can’t use two APs to wirelessly connect two non-wireless LANs together.
You can, however, use another type of product called a Wireless Bridge to get connected! See this article for more info.
|SW Proxy Servers|
|NAT SW (ICS, Sygate, etc)|
|NAT HW Routers|
|NAT HW & SW|