Need help with button and motion tween...

Question

I'm trying to create a simple game. Right now I have one button that when clicked moves the character across the screen. My issue is trying to make the player stop looping after I click the button. If I just insert stop for the last frame it will only loop once and stop, but it will not play again after the button is clicked. I've tried using players_turn boolean but couldn't get that to work. Any help will be appreciated. Thanks!
[AS]
package
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.events.KeyboardEvent;
    import flash.ui.Keyboard;
    import flash.events.Event;
    import flash.ui.Mouse;
    public class Main extends MovieClip
        //Player variables
        var players_turn:Boolean = true;
        //Enemy variables
        public function Main()
            //Add event listeners
            buttonAttack.addEventListener(MouseEvent.CLICK, onButtonAttackClick);
        //Event handlers
        function onButtonAttackClick(event:MouseEvent):void
            if (players_turn == true)
                //Player attacks enemy
                player.gotoAndStop(2);
                trace("attack");
                trace(players_turn);
        //trace(players_turn);
        /*if (players_turn == false)
            player.stop();
            players_turn = true;
[/AS]

Answer 1

player is a symbol that is classic tweened. It has to frames. The first is a still frame with a stop action. The second has been converted as a symbol to show the player move across the screen and back.   When the attack button is clicked the player moves across the screen and back but it keeps on looping. If I add a stop action to the last frame it will move and comeback and stop but it will not move anymore when the button is clicked again.