LoadLevel Doesn't have script

i have a main menu scene, that goes to the game scene without problems, but when i go back to the menu, the menu script doesn't show. Any solutions?

Main Menu

 private var canShow : boolean = false;
 var Skin : GUISkin;
 
 private var Name : String;
 var playerName : String;
 
 private var lastScore : int;
 private var myscore : int;
 
 function Awake()
 {
     Name = PlayerPrefs.GetString("MyName");
     playerName = Name;
     
     myscore = PlayerPrefs.GetInt("MyScore"); 
     lastScore = myscore;
 }
 
 function Update()
 {
     Go();
 }
 
 function OnGUI()
 {
     //GUI.skin = Skin;
 
     if(canShow == true)
     {
         if(GUI.Button(Rect(Screen.width/2 - 200, Screen.height/2, 400, 100), "New Game"))
         {
             Application.LoadLevel(1);
         }
         
         if(GUI.Button(Rect(Screen.width/2 - 200, Screen.height/2 + 100, 400, 100), "Quit Game"))
         {
             Application.Quit();
         }
         
         GUI.Box(Rect(0, 0, 200, 150),"Welcome Back");
         playerName = GUI.TextField(Rect(50, 25, 100, 25), playerName, 10);
         
         PlayerPrefs.SetString("MyName", playerName);
         
         
         GUI.Box(Rect(50, 75, 100, 25), "Last Score");
         GUI.Box(Rect(50, 100, 100, 25), lastScore.ToString());
     }
 }
 
 function Go()
 {
     yield WaitForSeconds(2);
     canShow = true;
 }

Pause

private var paused : boolean = false;

function Awake() { Screen.lockCursor = true; }

function Update() { if(Input.GetButtonDown("Pause")) { if(Screen.lockCursor == false) { Screen.lockCursor = true; Time.timeScale = 1.0;

         MouseLook.sensitivityX = normalSensitivity;
         MouseLook.sensitivityY = normalSensitivity;
         
         paused = false; 
     }
     
     else
     
     {
         Screen.lockCursor = false;
         Time.timeScale = 0.0;
         
         MouseLook.sensitivityX = 0;
         MouseLook.sensitivityY = 0;
         
         paused = true;
     }        
 }

}

function OnGUI() { if(paused == true) { if(GUI.Button(Rect(Screen.width/2 - 200, Screen.height/2, 400, 100), "Main Menu")) { Application.LoadLevel(0); }

     if(GUI.Button(Rect(Screen.width/2 - 200, Screen.height/2 + 100, 400, 100), "Quit Game"))
     {
         Application.Quit();
     }

     GUI.Box(Rect(Screen.width/2 - 100, Screen.height/2 - 100, 200, 50), "Paused");    
 }

}