How to load saved data from another scene?

I'm making a third person game of space exploration.

Actualy, I made an InGameMenu that let the user save and load his game and this it's working corretly, using the following Javascript:

 function Update ()
 {
     if(Input.GetKeyDown(KeyCode.Escape))
     {
         openMenu = true;
     }
     PlayerX =(PlayerPosition.transform.position.x);
     PlayerY =(PlayerPosition.transform.position.y);
     PlayerZ =(PlayerPosition.transform.position.z);
 }
 
 function OnGUI ()
 {
     if(openMenu == true)
     {
         if (GUI.Button(Rect(Screen.width/2-50,180,boxX,boxY), "Salva")) //Save game
         {
             Debug.Log("Salva");
             saveAttributes();
             saveText.enabled = true;
 
         }
         if (GUI.Button(Rect(Screen.width/2-50,260,boxX,boxY), "Carica")) //Load Game
         {
             Debug.Log("Carica");
             loadstuff();
         }
         if (GUI.Button(Rect(Screen.width/2-50,340,boxX,boxY), "Torna al menu"))
         Application.LoadLevel("mainMenu"); //Return to MainMenu
         
         if (GUI.Button(Rect(Screen.width/2-50,420,boxX,boxY), "Chiudi")) //Close InGameMenu
         openMenu = false;
     }
 }
 
 // a function created to save a game
 function saveAttributes()
 {
     if(saveOn == true)
         PlayerPrefs.SetInt("SCurPe", shipStats.curPe);  //Experience Points
         PlayerPrefs.SetInt("SCurPc", shipStats.curPc);  //Life
         PlayerPrefs.SetInt("SCurPs", shipStats.curPs);  //Shield
         PlayerPrefs.SetInt("SLevel", shipStats.level);  //Level of the player
         PlayerPrefs.SetFloat("PlayerX",PlayerPosition.transform.position.x); //position on X
         PlayerPrefs.SetFloat("PlayerY",PlayerPosition.transform.position.y); //position on Y
         PlayerPrefs.SetFloat("PlayerZ",PlayerPosition.transform.position.z); //position on Z
         Debug.Log("Salvato");
 }
 
 // a function created to load a game
 function loadstuff()
 {
     if(loadOn == true)
         Debug.Log("loaded");
         shipStats.curPe = PlayerPrefs.GetInt("SCurPe");
         shipStats.curPc = PlayerPrefs.GetInt("SCurPc");
         shipStats.curPs = PlayerPrefs.GetInt("SCurPs");
         shipStats.level = PlayerPrefs.GetInt("SLevel");
         PlayerPosition.transform.position.x = (PlayerPrefs.GetFloat("PlayerX"));
         PlayerPosition.transform.position.y = (PlayerPrefs.GetFloat("PlayerY"));
         PlayerPosition.transform.position.z = (PlayerPrefs.GetFloat("PlayerZ"));
         Debug.Log("Caricato");
 }

But I've a problem when I try to load that saved data from another scene, in particular case, from my MainMenu:

 #pragma strict
 
 var boxX : float = 100;
 var boxY : float = 50;
 var saveOn : boolean = false;
 var loadOn : boolean = false;
 
 private var PlayerX : float;
 private var PlayerY : float;
 private var PlayerZ : float;
 var PlayerPosition : Transform;
 
 function Update ()
 {
     PlayerX =(PlayerPosition.transform.position.x);
     PlayerY =(PlayerPosition.transform.position.y);
     PlayerZ =(PlayerPosition.transform.position.z);
 }
 
 function OnGUI ()
 {
     {
         if (GUI.Button(Rect(Screen.width/2-100,180,boxX,boxY), "Nuova Partita")) //New Game
         {
             Application.LoadLevel("Universe");
         }
         if (GUI.Button(Rect(Screen.width/2-100,260,boxX,boxY), "Carica Partita")) //Load Game
         {
             loadstuff();
         }
         if (GUI.Button(Rect(Screen.width/2-100,340,boxX,boxY), "Chiudi")) //Close the game
         {
             Application.Quit();
         }
     }
 }

 //Function to load the game
 function loadstuff()
 {
     if(loadOn == true)
         Debug.Log("loaded");
         shipStats.curPe = PlayerPrefs.GetInt("SCurPe");
         shipStats.curPc = PlayerPrefs.GetInt("SCurPc");
         shipStats.curPs = PlayerPrefs.GetInt("SCurPs");
         shipStats.level = PlayerPrefs.GetInt("SLevel");
         PlayerPosition.transform.position.x = (PlayerPrefs.GetFloat("PlayerX"));
         PlayerPosition.transform.position.y = (PlayerPrefs.GetFloat("PlayerY"));
         PlayerPosition.transform.position.z = (PlayerPrefs.GetFloat("PlayerZ"));
         Debug.Log("Caricato");
 }

When I press "Nuova partita", it'll start correctly a new game; if I press "Chiudi", it'll close the game, but, when I press "Carica", nothing happen. If I try to start a game and then use the InGameMenu to load the saved game, it work perfectly, so it's just a problem of the MainMenu.

Any idea on how to correct the script to make it possibile to load the saved game, from the MainMenu?