Unity3d build project gui

 using UnityEngine;
 using System.Collections;
 
 public class $$anonymous$$enu_$$anonymous$$anager : $$anonymous$$onoBehaviour {
 
     //BOOLEANS
     bool menuGUI = true;
     bool serverGUI = false;
 
     //FLOATS
     public float respawnTimer = 0;
 
     //STRINGS
     string Username;
 
     // Use this for initialization
     void Start () {
         Username = PlayerPrefs.GetString ("Username");
     }
     void OnDestroy(){
         PlayerPrefs.SetString ("Username", Username);
     }
     
     // Update is called once per frame
     void Update () {
         if(respawnTimer > 0){
             respawnTimer -= Time.deltaTime;
         }
         if(respawnTimer < 0){
             respawnTimer = 0;
             SpawnPlayer();
         }
     }
 
     void OnGUI(){
         if(menuGUI){
             GUI.Label (new Rect (0, 0, 100, 20), "Username:");
             Username = GUI.TextField (new Rect (65, 0, 125, 20), Username, 16);
 
             if(GUI.Button(new Rect(65,40,100,20), "$$anonymous$$ultiplayer")){
                 menuGUI = false;
                 //Connect ();
                 serverGUI = true;
             }
         }
         if(serverGUI){
             if(GUI.Button (new Rect(65,40,150,20), "Join Random Server")){
                 Connect ();
                 serverGUI = false;
             }
         }
     }
 
 
     void Connect(){
         PhotonNetwork.ConnectUsingSettings ("Alpha Version 0.1");
     }
 
     void OnJoinedLobby(){
         PhotonNetwork.JoinRandomRoom ();
     }
 
     void OnPhotonRandomJoinFailed(){
         PhotonNetwork.CreateRoom (null);
     }
 
     void OnJoinedRoom(){
         SpawnPlayer ();
     }
 
 
 
     void SpawnPlayer(){
         PhotonNetwork.player.name = Username;
         Screen.lockCursor = true;
         GameObject Player = (GameObject)PhotonNetwork.Instantiate ("Character", Vector3.zero, Quaternion.identity, 0);
 
         Player.GetComponent<$$anonymous$$ouseLook> ().enabled = true;
         Player.GetComponent<Character$$anonymous$$otor> ().enabled = true;
         Player.GetComponent<FPSInputController> ().enabled = true;
 
         Player.transform.Find ("$$anonymous$$ain Camera").GetComponent<$$anonymous$$ouseLook> ().enabled = true;
         Player.transform.Find ("$$anonymous$$ain Camera").camera.enabled = true;
     }
 }