Help with mouse down event please?

hey everybody i want to create an effect something like the famous helicopter game.

but when i write something like:

stage.addEventListener(MouseEvent.CLICK,thrust);

function thrust(e:Event) {
heli.y-=10;
}

:
it only goes up every time i click the mouse. i want it to continually go up when i hold down the mouse just like in the game.

any help would be much appreciated…