Moving running cycle in AS3

Question

I want to make a moving character that runs a movie clip when a keyboard arrow is pressed.For example:

When no arrows are pressed I want the character not to move when any keyboard arrows are pressed and run a movie clip animation where the character runs when the right arrow is pressed and same with the left arrow.

var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;

movieClip_1.addEventListener(Event.ENTER_FRAME,fl_MoveInDirectionOfKey);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed);

function fl_MoveInDirectionOfKey(event:Event)
{
    if (upPressed)
     {
         movieClip_1.y -= 5;
     }
if (downPressed)
{
    movieClip_1.y += 5;
}
if (leftPressed)
{
    movieClip_1.x -= 5;
}
if (rightPressed)
{
    movieClip_1.x += 5;
}
}

  function fl_SetKeyPressed(event:KeyboardEvent):void
 {
     switch (event.keyCode)
     {
         case Keyboard.UP:
        {
        upPressed = true;
        break;
        }
    case Keyboard.DOWN:
    {
        downPressed = true;
        break;
    }
    case Keyboard.LEFT:
    {
        leftPressed = true;
        break;
    }
    case Keyboard.RIGHT:
    {
        rightPressed = true;
        break;
    }
}
 }

 function fl_UnsetKeyPressed(event:KeyboardEvent):void
 {
    switch (event.keyCode)
    {
       case Keyboard.UP:
    {
        upPressed = false;
        break;
    }
    case Keyboard.DOWN:
    {
            downPressed = false;
        break;
        }
        case Keyboard.LEFT:
    {
        leftPressed = false;
        break;
        }
    case Keyboard.RIGHT:
    {
        rightPressed = false;
        break;
        }
}
}

My movie clips are: run_right and run_left.

My timeline:

Answer 1

Create a MovieClip called "movieClip_1".

var movieClip_1= new MovieClip_1();

Inside this MovieClip, add "run_right" animation on the first frame and "run_left" on the second frame.

I mean, add new MovieClips that contains your animations.

Then, go to fl_MoveInDirectionOfKey function and write this:

if (rightPressed)
{
   movieClip_1.gotoAndStop(1);
}
else if (leftPressed)
{
   movieClip_1.gotoAndStop(2);
}
else
{
   // no animation
   // movieClip_1.gotoAndStop(3);  idle animation could be on frame 3
}