Button on pause menu not showing up

This is my pause menu script:

 var paused : boolean = false; 
 
 var pausedGUI : GUITexture;  
 
 var gameName : String = "Your Game";
 
 
 var mainMenuSceneName : String;
 
 var pauseMenuFont : Font;
 private var pauseEnabled = false;
 
 function Start(){
 
  pauseEnabled = false;
  Time.timeScale = 1;
  AudioListener.volume = 1;
  Screen.showCursor = false;
 }
 
 function Update(){
 
  //check if pause button (escape key) is pressed
  if(Input.GetKeyDown("escape")){
  
  //check if game is already paused 
  if(pauseEnabled == true){
  //unpause the game
  pauseEnabled = false;
  Time.timeScale = 1;
  AudioListener.volume = 1;
  Screen.showCursor = false; 
  }
  
  //else if game isn't paused, then pause it
  else if(pauseEnabled == false){
  pauseEnabled = true;
  AudioListener.volume = 0;
  Time.timeScale = 0;
  Screen.showCursor = true;
  }
  }
 }
 
 private var showGraphicsDropDown = false;
 
 function OnGUI() {
 
  GUI.skin.box.font = pauseMenuFont;
 GUI.skin.button.font = pauseMenuFont;
 
  if(pauseEnabled == true){
  
  //Make a background box
  GUI.Box(Rect(Screen.width /2 - 100,Screen.height /2 - 150,250,200), "Pause Menu");
  
  //Make Main Menu button
  if(GUI.Button(Rect(Screen.width /2 - 100,Screen.height /2 - 100,250,50), "Main Menu")){
  Application.LoadLevel(mainMenuSceneName);
  }
  
  //Make Change Graphics Quality button
  if(GUI.Button(Rect(Screen.width /2 - 100,Screen.height /2 - 50 ,250,50), "Change Graphics Quality")){
  
  if(showGraphicsDropDown == false){
  showGraphicsDropDown = true;
  }
  else{
  showGraphicsDropDown = false;
  }
  }
  
  //Create the Graphics settings buttons, these won't show automatically, they will be called when
  //the user clicks on the "Change Graphics Quality" Button, and then dissapear when they click
  //on it again....
  if(showGraphicsDropDown == true){
  if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 - 100 ,250,50), "Fastest")){
  QualitySettings.currentLevel = QualityLevel.Fastest;
  }
  if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 - 50,250,50), "Fast")){
  QualitySettings.currentLevel = QualityLevel.Fast;
  }
  if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 ,250,50), "Simple")){
  QualitySettings.currentLevel = QualityLevel.Simple;
  }
  if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 50,250,50), "Good")){
  QualitySettings.currentLevel = QualityLevel.Good;
  }
  if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 100,250,50), "Beautiful")){
  QualitySettings.currentLevel = QualityLevel.Beautiful;
  }
  if(GUI.Button(Rect(Screen.width /2 + 150,Screen.height /2 + 150,250,50), "Fantastic")){
  QualitySettings.currentLevel = QualityLevel.Fantastic;
  }
  
  if(Input.GetKeyDown("escape")){
  showGraphicsDropDown = false;
  }
  }
  }
    if(pauseEnabled == true){ 
  //Save game button
  var box : GUIStyle = "box";   
    if(GUI.Button(Rect(Screen.width /2 - 100,Screen.height /2 ,250,50), "Save Game")){
 
     GUILayout.BeginVertical(); 
     GUILayout.FlexibleSpace();
     if(GUILayout.Button("Save Game"))
     {
        LevelSerializer.SaveGame(gameName);
     }
     GUILayout.Space(60);
     for(var sg in LevelSerializer.SavedGames[LevelSerializer.PlayerName]) { 
        if(GUILayout.Button(sg.Caption)) { 
          sg.Load(); 
          Time.timeScale = 1;
          } 
     } 
     GUILayout.FlexibleSpace();
     GUILayout.EndVertical();
     GUILayout.EndArea();
     //Make quit game button
  if (GUI.Button (Rect (Screen.width /2 - 100,Screen.height /2 + 50,250,50), "Quit Game")){
  Application.Quit();
  }
 
 
 }
 
 }
 
 }

My problem is that the quit game button doesn't show, all the other buttons show when I pause the game but the quit game button just isn't there.