Remote camera to wireless network

I have a pond on the opposite side of my house from where my computer, internet cable and Time Capsule/airport are located. Does anybody know of a camera that will broadcast to my current wireless network so I can watch my pond from the house? Could an Airport Express be plugged into power on the pond side of the house and connect wirelessly to my current wireless network and broadcast the pictures from the pond camera?
Most of the cameras I have found want to be plugged directly into the router or your modem.
I appreciate any and all help!

Can you connect wirelessly near the pond where where you would like to have the camera set up? If so what about something like this?

Lorex LW2100 CCTV camera - fixed - outdoor - weatherproof