How do you call two actionscript files in another as3

Question

My problem is that i what to call two actionscript files in another one, but cant do it.
This is are the two codes i want to play at the same time in my scene:
Code 1
* Inventory System Manager
* DATE: 07/24/2010
* AS3
* UPDATES AND DOCUMENTATION AT: http://www.FreeActionScript.com
package 
    import flash.display.Sprite;
    import com.freeactionscript.inventorySystem.InventorySystem;
    public class Main extends Sprite
        private var _inventorySystem:InventorySystem;
        public function Main()
            //InventorySystem(reference to stage in the fla)
            _inventorySystem = new InventorySystem(this);
Code 2
* Player Movement - 8-way keyboard
* VERSION: 1.0
* DATE: 9/23/2010
* AS3
* UPDATES AND DOCUMENTATION AT: http://www.FreeActionScript.com
package 
    import flash.display.MovieClip;
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    import flash.ui.Keyboard;
    public class Main extends MovieClip
        // player
        private var _player:MovieClip;
        // player settings
        private var _playerSpeed:Number = 4;
        // movement flags
        private var _movingUp:Boolean = false;
        private var _movingDown:Boolean = false;
        private var _movingLeft:Boolean = false;
        private var _movingRight:Boolean = false;
         * Constructor
        public function Main()
            createPlayer();
            // add listeners
            stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);           
            stage.addEventListener(KeyboardEvent.KEY_DOWN, myOnPress);
            stage.addEventListener(KeyboardEvent.KEY_UP, myOnRelease);
         * Creates player
        private function createPlayer():void
            _player = new Player();
            _player.x = stage.stageWidth / 2;
            _player.y = stage.stageHeight / 2;
            stage.addChild(_player);
         * EnterFrame Handlers
        private function enterFrameHandler(event:Event):void
            // Move up, down, left, or right
            if ( _movingLeft && !_movingRight )
                _player.x -= _playerSpeed;
                _player.rotation = 270;
            if ( _movingRight && !_movingLeft )
                _player.x += _playerSpeed;
                _player.rotation = 90;
            if ( _movingUp && !_movingDown )
                _player.y -= _playerSpeed;
                _player.rotation = 0;
            if ( _movingDown && !_movingUp )
                _player.y += _playerSpeed;
                _player.rotation = 180;
            // Move diagonally
            if ( _movingLeft && _movingUp && !_movingRight && !_movingDown )
                _player.rotation = 315;
            if ( _movingRight && _movingUp && !_movingLeft && !_movingDown )
                _player.rotation = 45;
            if ( _movingLeft && _movingDown && !_movingRight && !_movingUp )
                _player.rotation = 225;
            if ( _movingRight && _movingDown && !_movingLeft && !_movingUp )
                _player.rotation = 135;
            //i will do
            if (_player.x > 550)
                _player.x = 550;
                _player.x = +_player.x;
            else if (_player.x < 50)
                _player.x = 50;
                _player.x = +_player.x;
            if (_player.y > 350)
                _player.y = 350;
                _player.y = +_player.y;
            else if (_player.y < 50)
                _player.y = 50;
                _player.y = +_player.y;
            trace ("Valor en x: " + _player.x);
            trace ("Valor en y: " + _player.y);
         * Key Press Handlers
        public function myOnPress(event:KeyboardEvent):void
            switch( event.keyCode )
                case Keyboard.UP:
                    _movingUp = true;
                    break;
                case Keyboard.DOWN:
                    _movingDown = true;
                    break;
                case Keyboard.LEFT:
                    _movingLeft = true;
                    break;
                case Keyboard.RIGHT:
                    _movingRight = true;
                    break;
         * Key Release Handlers
        public function myOnRelease(event:KeyboardEvent):void
            switch( event.keyCode )
                case Keyboard.UP:
                    _movingUp = false;
                    break;
                case Keyboard.DOWN:
                    _movingDown = false;
                    break;
                case Keyboard.LEFT:
                    _movingLeft = false;
                    break;
                case Keyboard.RIGHT:
                    _movingRight = false;
                    break;
Hope you help me =)

Answer 1

You need to have a reference to an instance of one class in the other class or the other way round in order to communicate between the two. Alternatively you can call a static function of one class from an instance of the other class.
Anyway, I suggest reading about object-oriented programming first (can be even a Java book) to understand how things work. Such basics really help and it's never shame to read it.
Good luck