[KaBELSEA]

addEventListener(KeyboardEvent.KEY_DOWN, key_pressed);
addEventListener(KeyboardEvent.KEY_UP, key_released);
addEventListener(Event.ENTER_FRAME,func);
 
        private function key_pressed(e:KeyboardEvent):void {
            switch (e.keyCode) {
                case Keyboard.LEFT :
	                isLeft = true;
                    break;
                case Keyboard.RIGHT :
	                isRight = true;
            }
        } // key_pressed()
 
        private function key_released(e:KeyboardEvent):void {
            switch (e.keyCode) {
                case Keyboard.LEFT :
	                isLeft = false;
                    break;
                case Keyboard.RIGHT :
	                isRight = false;
                    break;
            }
        } // key_released()
 
        function func(e:Event)
        {
               if(isLeft)
                     obj.x--;
        } // func()

типа так )