var move:uint = 8;

Object(root).player_mc.addEventListener(Event.ENTER_FRAME,enterframe);
function enterframe(e:Event):void
{

	stage.addEventListener(KeyboardEvent.KEY_DOWN,onKeydown);
	function onKeydown(e:KeyboardEvent):void
	{

		if (e.keyCode == Keyboard.RIGHT)
		{
			Object(root).player_mc.x +=  move;
		}
		if (e.keyCode == Keyboard.LEFT)
		{
			Object(root).player_mc.x -=  move;
		}
		if (e.keyCode == Keyboard.UP)
		{
			Object(root).player_mc.y -=  move;
		}
		if (e.keyCode == Keyboard.DOWN)
		{
			Object(root).player_mc.y +=  move;
		}

		e.updateAfterEvent();

	}
}