Simple Topdown Movement Problem

Hello,

I'm fairly new to Unity and Javascript but I'm trying to make a simple topdown game with Unity set to 2D.

Now I made this code for moving over the X and Y axis but when I run the game the player is only able to walk right and down.

#pragma strict

 function Start () {
 
 }
 
 var moveLeft: KeyCode;
 var moveRight: KeyCode;
 var moveUp: KeyCode;
 var moveDown: KeyCode;
 
 var hspeed = 5;
 var vspeed = 5;
 
 <pre>function FixedUpdate () {
 
     if (Input.GetKey(moveLeft))
     {
         rigidbody2D.velocity.x = -hspeed;
     }
     else
     {    
         rigidbody2D.velocity.x = 0;
     }
     
     if (Input.GetKey(moveRight))
     {
         rigidbody2D.velocity.x = hspeed;
     }
     else
     {    
         rigidbody2D.velocity.x = 0;
     }
 
     if (Input.GetKey(moveUp))
     {
         rigidbody2D.velocity.y = vspeed;
     }
     else
     {
         rigidbody2D.velocity.y = 0;
     }
     
     if (Input.GetKey(moveDown))
     {
         rigidbody2D.velocity.y = -vspeed;
     }
     else
     {
         rigidbody2D.velocity.y = 0;    
     }
 }</code>

Does anyone know where it goes wrong?

Thanks in advance