Since you're using Cat5, you have more "pairs" in the cable than you need for just video, audio, and ground. You can use one of those unused pairs for power. I did just that in order to create a "remote rf" version, where the rf transmitter is about 50 feet from the actual camera. Unfortunately, I didn't think to take any pictures, and the camera is high up under a house eve, so I can't go look. If you can find that original post on how to do the conversion, I think there's a little diagram somewhere that identifies which wire is the camera power.
BTW, the power can be "injected" anywhere along the length of cat5! So wherever your cable passes by an available outlet, just carefully open the cable at that point to access your "power pair". Like someone mentioned in your other post thread, putting more than one camera on a single power supply is probably NOT a good idea.
Hope that helps.
ITguy