Caurina tweener - trying to stop it tweening

Hi,

I have a timer, that calculates 2 seconds and after each 2 seconds it tweens my movie clip using caurina,

what I am trying to do is to stop it tweening,

what I am trying to do is something like this:

myMC.addEventListener(MouseEvent.MOUSE_DOWN, function() {
countTime.stop();

movieclip._enabled = false; (so that it will stop being moved by caurina)

I know the above line is wrong in actionscript 3

could anyone help me?