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);
}

}

It is ‘Application.Quit()’. Application.CancelQuit() abandons a quit in progress. Note Quit() will not work in the editor, only in a built app.