Switch Replacement

I bought a house with my wife not to long ago, that is going to need a good amount of work. I've replaced a couple old switches and outlets already, so I know the wiring of this house is a nightmare. Now I'm trying to replace a sliding dimmer switch with a normal light switch, but when I went to remove the outlet, there was a wire setup I've never seen before, and don't really understand. The open wires in the pictures are where the original switch was disconnected. In every configuration I've tried so far, the other switch will work fine, but the new switch (and attached light fixture) have no power. The only thing I can think of is that I'm trying to install a 3 pole switch, and need to try a single pole switch. Any other ideas?