Using Gamepad to access onGUI menus?

Hi everyone, the first scene in my game requires access with a mouse to start a new game or load a saved game.

I need to make the GUI accessible with a controller, but I after a lot of browsing and googling I am very stuck.

Here is the working code so far,

 using UnityEngine;
 using System.Collections;
 
 public class LoadGame : MonoBehaviour {
     public Texture2D[] playerPic = new Texture2D[1];
     public int saveSlot = 0;
     public GameObject[] playerPrefab = new GameObject[1];
     public string startScene = "Stage1";
     private Vector3 lastPosition;
     private bool  menu = true;
     private bool charSelectMenu = false;
     private bool loadMenu = false;
     // Use this for initialization
     void Start () {
         Time.timeScale = 1.0f;
         menu = true;
         charSelectMenu = false;
         loadMenu = false;
     }
     
     void  OnGUI (){
         if(menu){
             if (GUI.Button ( new Rect(Screen.width / 2 - 150,185,300,120), "New Game")) {
                 charSelectMenu = true;
                 loadMenu = false;
                 menu = false;
             }
             if (GUI.Button ( new Rect(Screen.width / 2 - 150,325,300,120), "Load Game")) {
                 loadMenu = true;
                 menu = false;
                 charSelectMenu = false;
             }
         }
         if(loadMenu){
             GUI.Box ( new Rect(Screen.width / 2 - 250,170,500,400), "Menu");
             if (GUI.Button ( new Rect(Screen.width / 2 + 185,175,30,30), "X")) {
                 loadMenu = false;
                 charSelectMenu = false;
                 menu = true;
             }
             //---------------Slot 1 [ID 0]------------------
             if(PlayerPrefs.GetInt("0PreviousSave") > 0){
                 if (GUI.Button ( new Rect(Screen.width / 2 - 200,205,400,100), PlayerPrefs.GetString("0Name") + "\n" + "Level " + PlayerPrefs.GetInt("0PlayerLevel").ToString())) {
                     //When Slot 1 already used
                     saveSlot = 0;
                     LoadData ();
                 }
             }else{
                 if (GUI.Button ( new Rect(Screen.width / 2 - 200,205,400,100), "- Empty Slot -")) {
                     //Empty Slot 1
                 }
             }
             //---------------Slot 2 [ID 1]------------------
             if(PlayerPrefs.GetInt("1PreviousSave") > 0){
                 if (GUI.Button ( new Rect(Screen.width / 2 - 200,315,400,100), PlayerPrefs.GetString("1Name") + "\n" + "Level " + PlayerPrefs.GetInt("1PlayerLevel").ToString())) {
                     //When Slot 2 already used
                     saveSlot = 1;
                     LoadData ();
                 }
             }else{
                 if (GUI.Button ( new Rect(Screen.width / 2 - 200,315,400,100), "- Empty Slot -")) {
                     //Empty Slot 2
                 }
             }
             //---------------Slot 3 [ID 2]------------------
             if(PlayerPrefs.GetInt("2PreviousSave") > 0){
                 if (GUI.Button ( new Rect(Screen.width / 2 - 200,425,400,100), PlayerPrefs.GetString("2Name") + "\n" + "Level " + PlayerPrefs.GetInt("2PlayerLevel").ToString())) {
                     //When Slot 3 already used
                     saveSlot = 2;
                     LoadData ();
                 }
             }else{
                 if (GUI.Button ( new Rect(Screen.width / 2 - 200,425,400,100), "- Empty Slot -")) {
                     //Empty Slot 3
                 }
             }
         }
         if(charSelectMenu){
             GUI.Box ( new Rect(Screen.width / 2 - 350,100,700,500), "Select Player");
             if (GUI.Button ( new Rect(Screen.width / 2 + 295,105,30,30), "X")) {
                 loadMenu = false;
                 charSelectMenu = false;
                 menu = true;
             }
             if (GUI.Button ( new Rect(Screen.width / 2 - 285,175,280,373), playerPic[0])) {
                     //Spawn playerPrefab[0]
                     NewGame(0);
             }
             if (GUI.Button ( new Rect(Screen.width / 2 + 35,175,280,373), playerPic[1])) {
                     //Spawn playerPrefab[1]
                     NewGame(1);
             }
         }
     }
     
     void  LoadData (){
         int spawnId = PlayerPrefs.GetInt(saveSlot.ToString() + "ID");
         GameObject respawn = Instantiate(playerPrefab[spawnId] , transform.position , transform.rotation) as GameObject;
         
         respawn.GetComponent<Status>().level = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerLevel");
         respawn.GetComponent<Status>().atk = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerATK");
         respawn.GetComponent<Status>().def = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerDEF");
         respawn.GetComponent<Status>().matk = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMATK");
         respawn.GetComponent<Status>().mdef = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMDEF");
         respawn.GetComponent<Status>().mdef = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMDEF");
         respawn.GetComponent<Status>().exp = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerEXP");
         respawn.GetComponent<Status>().maxExp = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMaxEXP");
         respawn.GetComponent<Status>().maxHealth = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMaxHP");
         respawn.GetComponent<Status>().health = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMaxHP");
         respawn.GetComponent<Status>().maxMana = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMaxMP");
         respawn.GetComponent<Status>().mana = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerMaxMP");    
         respawn.GetComponent<Status>().statusPoint = PlayerPrefs.GetInt(saveSlot.ToString() + "PlayerSTP");
         //-------------------------------
         respawn.GetComponent<Inventory>().cash = PlayerPrefs.GetInt(saveSlot.ToString() + "Cash");
         int itemSize = respawn.GetComponent<Inventory>().itemSlot.Length;
         int a = 0;
         if(itemSize > 0){
             while(a < itemSize){
                 respawn.GetComponent<Inventory>().itemSlot[a] = PlayerPrefs.GetInt(saveSlot.ToString() + "Item" + a.ToString());
                 respawn.GetComponent<Inventory>().itemQuantity[a] = PlayerPrefs.GetInt(saveSlot.ToString() + "ItemQty" + a.ToString());
                 //-------
                 a++;
             }
         }
         
         int equipSize = respawn.GetComponent<Inventory>().equipment.Length;
         a = 0;
         if(equipSize > 0){
             while(a < equipSize){
                 respawn.GetComponent<Inventory>().equipment[a] = PlayerPrefs.GetInt(saveSlot.ToString() + "Equipm" + a.ToString());
                 a++;
             }
         }
         respawn.GetComponent<Inventory>().weaponEquip = 0;
         respawn.GetComponent<Inventory>().armorEquip = PlayerPrefs.GetInt(saveSlot.ToString() + "ArmoEquip");
         if(PlayerPrefs.GetInt(saveSlot.ToString() + "WeaEquip") == 0){
             respawn.GetComponent<Inventory>().RemoveWeaponMesh();
         }else{
             respawn.GetComponent<Inventory>().EquipItem(PlayerPrefs.GetInt(saveSlot.ToString() + "WeaEquip") , respawn.GetComponent<Inventory>().equipment.Length + 5);
         }
         //----------------------------------
         //Load Skill Slot
         a = 0;
         while(a <= 2){
             respawn.GetComponent<SkillWindow>().skill[a] = PlayerPrefs.GetInt(saveSlot.ToString() + "Skill" + a.ToString());
             a++;
         }
         respawn.GetComponent<SkillWindow>().AssignAllSkill();
         DontDestroyOnload dst = respawn.GetComponent<DontDestroyOnload>();
         if(!dst){
             respawn.gameObject.AddComponent<DontDestroyOnload>();
         }
         Time.timeScale = 1.0f;
         Application.LoadLevel(startScene);
         
     }
     
     void NewGame(int id){
         Time.timeScale = 1.0f;
         //Spawn Player from received ID
         GameObject spawn = Instantiate(playerPrefab[id] , transform.position , transform.rotation) as GameObject;
         DontDestroyOnload dst = spawn.GetComponent<DontDestroyOnload>();
         if(!dst){
             spawn.gameObject.AddComponent<DontDestroyOnload>();
         }
         Application.LoadLevel(startScene);
     }
 }

If I find a solution I will post it here, thank you for your time.