c# Quit button wont quit game

the code i'm using dose not quit the game when i press the button what might i be doing wrong

here is the none working code(i have also try'ed just Quit instead of CancelQuitnut that dont work either)

 if(GUI.Button(new Rect(1020,40,110,25), "Quit Game")) {
         Application.CancelQuit();

my script

/// /// PlayerHealth.cs /// Display the players health in game /// /// Attach this class to your player character /// using UnityEngine; using System.Collections;

public class PlayerHealth : MonoBehaviour {

 private const string DEFAULT_DROP_ZONE_NAME = "dz_Default2";
 public GameObject destination;
 
 public int maxHealth = 100;
 public int curHealth = 100;
 public float attackTimer;
 public float coolDown;
 
 
 public float healthBarLength;

 // Use this for initialization
 void Start () {
     attackTimer = 0;
     coolDown = 4f;
     
     healthBarLength = Screen.width / 2;
 }
 
 // Update is called once per frame
 void Update () {
     AddjustCurrentHealth(0);
     
         if(attackTimer > 0)
         attackTimer -= Time.deltaTime;
     
     if(attackTimer < 0)
         attackTimer = 0;
     
     if(Input.GetKeyDown(KeyCode.H))            
         if(attackTimer == 0) {
             AddjustCurrentHealth(10);
             
             attackTimer = coolDown;
             
     }
 }
 
 void OnGUI() {
     GUI.Box(new Rect(10, 10, healthBarLength, 20), curHealth + "/" + maxHealth);
     GUI.Box (new Rect (580,10,65,25),"Heal (H)");
     if(GUI.Button(new Rect(1020,10,110,25), "Reset Game")) {
                 Application.LoadLevel(0);
     }
             if(GUI.Button(new Rect(1020,40,110,25), "Quit Game")) {
                 Application.CancelQuit();
     }
 }
 
 public void AddjustCurrentHealth(int adj) {
     curHealth += adj;
     
     if(curHealth < 0)
         curHealth = 0;
     
     if(curHealth > maxHealth)
         curHealth = maxHealth;
     
     if(maxHealth < 1)
         maxHealth = 1;
     
     if(curHealth <= 0)

{

        if( destination == null )

         destination = GameObject.Find( DEFAULT_DROP_ZONE_NAME );
          transform.position = destination.transform.position;
     

}

     healthBarLength = (Screen.width / 2) * (curHealth / (float)maxHealth);
 }
 
         
 

}