see diagram at center of this thread
[Link: remotecentral.com]Seroisly though, this could be simple and inexpensive.
-Go to the big orange home impoverment store and buy a good motion light fixture (you can set it to go off after a few minutes. Besides, who knows? Maybe you could also use it to light the secure area!)
anyway, use a light bulb to A/C adapter, plug in the monitor and turn it on.
Most motion detector light fixtures will let you set to "steady on" too.