Light+Dark+Sensor

I Found the Light/Dark Sensor based on 741 op amp. The schematic attached. It's a very simply circuit which shown you when is dark and when is light. What do you think about that?

Updated 21/02/2010

I've tried to connect the circuit today, removed the Transistor relay and diode form the circuit as James told me. But it dosn't work. I'm completly confused with that. I'll bring the stuff on Tu, so I hope you help me sort it out what's wrong.