StarDrag Function not working?

1

Hi i am trying to create a start drag function for my site so i can drag a movieclip and move it around the stage however when i run the code it runs fine until i click on the movieclip and i get a error message saying:

ReferenceError: Error #1065: Variable car4 is not defined.

the movie clip i am trying to move is called car4 and i have the movieclip placed on the stage and i have changed the instance name to car4 so i cant understand were the error is coming from, i have never use the StarDrag method b4 so i dont know weather it could be that can any1 please help me?? my code is shown below:


import flash.display.MovieClip;
import flash.events.Event;
import flash.events.MouseEvent;


car4.addEventListener(MouseEvent.MOUSE_DOWN, holderMouseDown);
car4.addEventListener(MouseEvent.MOUSE_UP, holderMouseUp);

function holderMouseDown(e:MouseEvent){
        car4.startDrag();
}
function holderMouseUp(e:MouseEvent){
        car4.stopDrag();
}