Shoot when GUI is pressed?

I am trying to make my gun shoot when a GUI button is pressed (I am developing for mobile platforms). Here is the GUI Button script, and scripts required to shoot: GUI Texture Button script (js):

 var fireButton : GUITexture;
 
 function Update(){
 
 for (var evt : Touch in Input.touches) {
 
 var HitTest1 = fireButton.HitTest(evt.position);
 
 if (evt.phase == TouchPhase.Began) {
 
 if(HitTest1){
 
 //do something when button is hit
 
 Debug.Log ("ButtonGUI Clicked");
 
 } } } }

The shoot scripts from Unity's FPS tutorial:

PlayerWeapons script (js):

 function Start () {
     // Select the first weapon
     SelectWeapon(0);
 }
 
 function Update () {
     // Did the user press fire?
     if (Input.GetButton ("Fire1"))
         BroadcastMessage("Fire");
     
     if (Input.GetKeyDown("1")) {
         SelectWeapon(0);
     }    
     else if (Input.GetKeyDown("2")) {
         SelectWeapon(1);
     }    
 }
 
 function SelectWeapon (index : int) {
     for (var i=0;i<transform.childCount;i++)    {
         // Activate the selected weapon
         if (i == index)
             transform.GetChild(i).gameObject.SetActiveRecursively(true);
         // Deactivate all other weapons
         else
             transform.GetChild(i).gameObject.SetActiveRecursively(false);
     }
 }

MachineGun script (js):

 var range = 100.0;
 var fireRate = 0.05;
 var force = 10.0;
 var damage = 5.0;
 var bulletsPerClip = 40;
 var clips = 20;
 var reloadTime = 0.5;
 private var hitParticles : ParticleEmitter;
 var muzzleFlash : Renderer;
 
 private var bulletsLeft : int = 0;
 private var nextFireTime = 0.0;
 private var m_LastFrameShot = -1;
 
 function Start () {
     hitParticles = GetComponentInChildren(ParticleEmitter);
     
     // We don't want to emit particles all the time, only when we hit something.
     if (hitParticles)
         hitParticles.emit = false;
     bulletsLeft = bulletsPerClip;
 }
 
 function LateUpdate() {
     if (muzzleFlash) {
         // We shot this frame, enable the muzzle flash
         if (m_LastFrameShot == Time.frameCount) {
             muzzleFlash.transform.localRotation = Quaternion.AngleAxis(Random.value * 360, Vector3.forward);
             muzzleFlash.enabled = true;
 
             if (audio) {
                 if (!audio.isPlaying)
                     audio.Play();
                 audio.loop = true;
             }
         } else {
         // We didn't, disable the muzzle flash
             muzzleFlash.enabled = false;
             enabled = false;
             
             // Play sound
             if (audio)
             {
                 audio.loop = false;
             }
         }
     }
 }
 
 function Fire () {
     if (bulletsLeft == 0)
         return;
     
     // If there is more than one bullet between the last and this frame
     // Reset the nextFireTime
     if (Time.time - fireRate > nextFireTime)
         nextFireTime = Time.time - Time.deltaTime;
     
     // Keep firing until we used up the fire time
     while( nextFireTime < Time.time && bulletsLeft != 0) {
         FireOneShot();
         nextFireTime += fireRate;
     }
 }
 
 function FireOneShot () {
     var direction = transform.TransformDirection(Vector3.forward);
     var hit : RaycastHit;
     
     // Did we hit anything?
     if (Physics.Raycast (transform.position, direction, hit, range)) {
         // Apply a force to the rigidbody we hit
         if (hit.rigidbody)
             hit.rigidbody.AddForceAtPosition(force * direction, hit.point);
         
         // Place the particle system for spawing out of place where we hit the surface!
         // And spawn a couple of particles
         if (hitParticles) {
             hitParticles.transform.position = hit.point;
             hitParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
             hitParticles.Emit();
         }
 
         // Send a damage message to the hit object            
         hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
     }
     
     bulletsLeft--;
 
     // Register that we shot this frame,
     // so that the LateUpdate function enabled the muzzleflash renderer for one frame
     m_LastFrameShot = Time.frameCount;
     enabled = true;
     
     // Reload gun in reload Time        
     if (bulletsLeft == 0)
         Reload();            
 }
 
 function Reload () {
 
     // Wait for reload time first - then add more bullets!
     yield WaitForSeconds(reloadTime);
 
     // We have a clip left reload
     if (clips > 0) {
         clips--;
         bulletsLeft = bulletsPerClip;
     }
 }
 
 function GetBulletsLeft () {
     return bulletsLeft;
 }

Can I add the PlayerWeapons task to a GUI button? Or do you know other ways to shoot when GUI is pressed?