ActionScript 3.0 :: Opening And Closing Doors?

Imagine a locker room that you can open and close the doors. I have the opening and closing working (one sample below) but I need to make it so that only one door can be open at any time. I had thought about using a boolean that switches between true and false within an if/else statement. If the boolean is false (no doors open) then the one clicked can open. As it opens it sets the boolean to true so no others can be opened. Trouble is to close it the way its set up right now you click it again and the movieclip's timeline continues and resets to the closed position. This is an issue because the opening of the door sets the boolean to true and I need a false value to click the button again and close the door.I'm building on top of a tutorial I've just run through so ignore the "response_mc" - although that's where I'd put a "Please close the open door first" line through the else function.

ActionScript Code:
// Door ActionScripting
mc_door1.buttonMode = true;
mc_door1.addEventListener(MouseEvent.MOUSE_DOWN, clickDoor1);[code].........

there are a total of 15 doors which are all set up the same way (a 15 frame movie clip that has its button mode turned on). Is there a less intense way of coding it rather than doing the above 15 times? Finally diving into AS3 and getting it slowly (been married to previous versions for so long it was hard to force myself to change).