pencey

Hi, I have a 2door 5speed 4V 2002 Honda Accord and was looking to add some extra lights inside the car. I wanted the lights to turn on (and/or blink) when i unlocked the car door just as the dome and other lights do. I do not want them to stay on forever though. I have a 3 way switch so i can turn them off, run forever and the 3rd i would like to have come on and off with the unlocking of my car (as i said). Is there any way you can help me as to how to do this and where to connect this third wire? Please let me know, thank you so much for your help!!