What am I doing wrong

I just tried to convert the following script, http://wiki.unity3d.com/index.php/ShootingWeaponScript

from C# to Java script and I got everything working except for one part and I am not sure what I am doing wrong. Here is the code that I am working with.

 var projecile : Rigidbody;
 var speed = 20;
 var  projMuzzleVelocity : float = 6.0; // in metres per second
 
 var  RateOfFire     : float = 6.0;
 var  Inaccuracy     : float = 6.0;
 var  fireTimer         : float = 6.0;
 
 function Start()
 {
     fireTimer = Time.time + RateOfFire;
 }
 
 function Update () 
 {
     if( Input.GetButtonUp("Fire1"))
     {
         Debug.DrawLine(transform.position, transform.position + transform.forward, Color.red);
         if (Time.time> fireTimer)
         {
             //GameObject.projectile;
             var muzzleVelocity : Vector3 = transform.forward;
             
             if (Inaccuracy != 0)
             {
                 var rand : Vector2 = Random.insideUnitCircle;
                 muzzleVelocity += new Vector3(rand.x, rand.y, 0) * Inaccuracy;
             }
             
             muzzleVelocity = muzzleVelocity.normalized * projMuzzleVelocity;
             //Debug.Log("Fire1");
             clone = Instantiate(projecile, transform.position, transform.rotation);
             
             //clone.velocity = transform.TransformDirection(muzzleVelocity);
             clone.velocity = transform.TransformDirection(Vector3(0,0,speed));
             fireTimer = Time.time + RateOfFire;
             Destroy(clone.gameObject,1.5);
         }
     }
      
 }

So I have tracked the problem to the following line but I am not sure how to make this work.

 clone.velocity = transform.TransformDirection(Vector3(0,0,speed));

If I make the above like this

 clone.velocity = transform.TransformDirection(muzzleVelocity);

everything will work but the player will only shot in one direction. So for example they will always shoot forward, even if they are standing backwards. Like I stated before I am pretty sure that it has something to do with how I am using muzzleVelocity but I am not sure that I am doing wrong.