Orient an object to the mouse cursor

How to orient an objet to an other ? Just put those lines and change the instance name myTank.
12345678910111213141516// This object will always look at the mouse cursor
myTank.addEventListener(Event.ENTER_FRAME, tankEnterFrame);
// This function will be launched every frame (25 times by seconds)
function tankEnterFrame(pEvt) {
// [...]