var coordX:Number = shaker_mc.x; 
var coordY:Number = shaker_mc.y;
var timer:Timer = new Timer(10);

shaker_mc.buttonMode = true;

shaker_mc.addEventListener(MouseEvent.ROLL_OVER,startShake);
shaker_mc.addEventListener(MouseEvent.ROLL_OUT,stopShake);
timer.addEventListener(TimerEvent.TIMER, shakeImage);
 
function startShake(e:MouseEvent):void{
 timer.start ()
}

function stopShake(e:MouseEvent):void{
 timer.stop();
 shaker_mc.x = coordX;
 shaker_mc.y = coordY;
 shaker_mc.rotation = 0;
}

function shakeImage(event:Event):void { 
 shaker_mc.x = coordX+ getMinusOrPlus()*(Math.random()*5); 
   shaker_mc.y = coordY+ getMinusOrPlus()*(Math.random()*5); 
   shaker_mc.rotation = getMinusOrPlus()* Math.random()*6; 
} 

function getMinusOrPlus():int{
 var rand : Number = Math.random()*2;
 if (rand<1) return -1
 else return 1;
}