GUI.Button To Change Weapons On Screen

Hello everyone,

I am trying to let the player/gamer choose between 2 weapons by clicking a button on the screen. With the Javascript below, I cannot get bullSelect or missSelect to return true when the specific button is pressed. The Debug.Log will show but the variables stay false. What is it that I am missing to get the variables to return true after the button is selected?

Thanks in advance for taking a look.

 var bullet : Transform;
 var missile : Transform;
 var bulletFire : AudioClip;
 var missileFire : AudioClip;
 var buttonStyle : GUIStyle;
 var bullSelect = false;
 var missSelect = false;
 
 function Start () {
 
 }
 
 function Update () 
 {
     if (Input.GetKeyDown("space"))    
     {
         if(bullSelect == true)
         {
             audio.clip = bulletFire;  
             audio.Play();
             Instantiate(bullet, transform.position, transform.rotation);
         }
     }

     if (Input.GetKeyDown("space"))
     {
         var G : GameObject = GameObject.FindGameObjectWithTag("Missile");
         if(!G && missSelect == true)
         {
             audio.clip = missileFire;
             audio.Play();
             Instantiate(missile, transform.position, transform.rotation);
         }
     }
 }
     
 function OnGUI ()
 {
     if(GUI.Button(Rect(180,Screen.height -80,90,30),"Bullet", buttonStyle))
     {
         missSelect = false;
         bullSelect = true;
         Debug.Log("You have selected the Bullet");
     }
         
     if(GUI.Button(Rect(180,Screen.height -40,90,30),"Missile", buttonStyle))
     {
         bullSelect = false;
         missSelect = true;
         Debug.Log("You have selected the Missile");
     }
 }