[mobile development] 2D Joystick Controller

hi everyone, first i'm sorry for mistake i can do with my english ! I've a problem with my code about mouvement for my little game. the movement i want is on X and Y axis. I've used the standart assest for mobile, the CameraRelativeController. but he doing so much things for my game, so I've edit the code. because my player can move on a 3D environment, and it's a 2D game, as a JetPack Joyroid movement.

The player can move correctly on X axis, but i don't know how to move on Y axis. I hope you can help me to solve this. I you need to know, this is the only code on Js, i'm scripting on C#

The new code on CameraRelativeController :

 #pragma strict
 
 // This script must be attached to a GameObject that has a CharacterController
 @script RequireComponent( CharacterController )
 
 var moveJoystick : Joystick;
 
 var cameraTransform : Transform; // The actual transform of the camera
 var speed : float = 5; // Ground speed     
 
 private var thisTransform : Transform;
 private var character : CharacterController;
 private var velocity : Vector3; // Used for continuing momentum while in air
 
 function Start()
 {
     // Cache component lookup at startup instead of doing this every frame    
     thisTransform = GetComponent( Transform );
     character = GetComponent( CharacterController );
 }
 
 function OnEndGame()
 {
     // Disable joystick when the game ends    
     moveJoystick.Disable();
     
     // Don't allow any more control changes when the game ends
     this.enabled = false;
 }
 
 function Update()
 {
     var movement = cameraTransform.TransformDirection( Vector3( moveJoystick.position.x, moveJoystick.position.y, 0 ) );
     movement.Normalize(); // Adjust magnitude after ignoring vertical movement
     
     // position of joystick
     var absJoyPos = Vector2( Mathf.Abs( moveJoystick.position.x ), Mathf.Abs( moveJoystick.position.y ) );
     
     ///
     /// The code I think isn't working
     /// initial code : ( ( absJoyPos.x > absJoyPos.y ) ? absJoyPos.x : absJoyPos.y );
     ///
     movement *= speed;
     movement.x *= absJoyPos.x;
     movement.y *= absJoyPos.y;
     
     // Apply gravity to our velocity to diminish it over time
     velocity.y += Physics.gravity.y * Time.deltaTime;
     
     
     movement += velocity;
     movement += Physics.gravity;
     movement *= Time.deltaTime;
     
     // Actually move the character
     character.Move( movement );
 }

thanks !!