Input.GetAxis doesn't seem to move me in the direction I am facing

I am trying to make a first-person-controlled, zero-gravity environment where you pretty much move in the direction you are facing, current velocity willing. (I'm using rigidbody movement) The scripts I am about to display work almost exactly how I want, except that the forward movement when looking up or down from the world X-Z plane doesn't move to where I am looking. For example, if I hit the start button and don't move the mouse to keep looking forward and hold W, I will move exactly forward. But if I move my mouse upward and and looking more vertically, when I hold W down, I move at less of an upward angle than where I am looking. How can I fix that?

For mouse look I am using this script:

 // Performs a mouse look.
 
 var horizontalSpeed : float = 2.0;
 var verticalSpeed : float = 2.0;
 
 function FixedUpdate () {
     // Get the mouse delta. This is not in the range -1...1
     var h : float = horizontalSpeed * Input.GetAxis ("Mouse X");
     var v : float = verticalSpeed * Input.GetAxis ("Mouse Y");
     transform.Rotate (-v, h, 0);
 }

For the character controller I am using this script:

 // These variables are for adjusting in the inspector how the object behaves 
 var maxSpeed = 7.000;
 var force = 8.000;
 var jumpSpeed = 5.000;
 
 // These variables are there for use by the script and don't need to be edited
 private var state = 0;
 private var grounded = false;
 private var jumpLimit = 0;
 
 // Don't let the Physics Engine rotate this physics object so it doesn't fall over when running
 function Awake ()
 { 
     rigidbody.freezeRotation = true;
 }
 
 // This part detects whether or not the object is grounded and stores it in a variable
 function OnCollisionEnter ()
 {
     state ++;
     if(state > 0)
     {
         grounded = true;
     }
 }
 
 
 function OnCollisionExit ()
 {
 state --;
     if(state < 1)
     {
         grounded = false;
         state = 0;
     }
 }
 
 // This is called every physics frame
 function FixedUpdate ()
 {
 
 
     // Get the input and set variables for it
     jump = Input.GetButtonDown ("Jump");
     horizontal = Input.GetAxis("Horizontal"); 
     vertical = Input.GetAxis("Vertical"); 
 
     // Set the movement input to be the force to apply to the player every frame
     horizontal *= force;
     vertical *= force;
 
     // If the object is grounded and isn't moving at the max speed or higher apply force to move it
     if(rigidbody.velocity.magnitude < maxSpeed)
     {
         rigidbody.AddForce (transform.rotation * Vector3.forward * vertical);
         rigidbody.AddForce (transform.rotation * Vector3.right * horizontal);
     }
 
     // This part is for jumping. I only let jump force be applied every 10 physics frames so
     // the player can't somehow get a huge velocity due to multiple jumps in a very short time
     if(jumpLimit < 10) jumpLimit ++;
 
     if(jump && grounded == true && jumpLimit >= 10)
     {
         rigidbody.velocity.y += jumpSpeed;
         jumpLimit = 0;
     }
  }