GuiButton Going To Next Level

Hi guys i've created a guibutton that starts a level but when i press it, it goes to the next level but doesnt remove the guibutton.The next level does not have any Scripts but i have no idea why the button is still there when it shouldnt be.Heres my script.

 using UnityEngine;
 using System.Collections;
 
 public class Menu : MonoBehaviour {
     
     private string CurMenu;
     public string Name;
     public string MatchName;
     public int Players;
     // Use this for initialization
     void Start () {
         CurMenu = "Main";
         Name = PlayerPrefs.GetString("PlayerName");
     }
     
     // Update is called once per frame
     void Update () {
         
     }
     
     void ToMenu(string menu){
         CurMenu = menu;
     }
     void OnGUI(){
         if (CurMenu == "Main")
             Main();
         if (CurMenu == "Host")
             Host();
         if (CurMenu == "Lobby")
             Lobby();
         if (CurMenu == "List")
             MatchList();
     }
     private void Main(){
         //if (GUI.Button(new Rect (0, 0, 128, 32), "Host A Match")) {
         // ToMenu ("Host");
         //}
         if (GUI.Button (new Rect (0, 0, 128, 32), "Host a match")) {
             ToMenu ("Host");
         }
         Name = GUI.TextField (new Rect (130, 0, 128, 32), Name);
         if (GUI.Button(new Rect (260, 0, 128, 32), "Save"))
             PlayerPrefs.SetString ("PlayerName", Name);
         if (GUI.Button(new Rect (0, 33, 128, 32), "Server List")){
             ToMenu ("List");
         }
         
         
     }
     
     private void Host(){
         if(GUI.Button(new Rect(0,0,128,32),"Start")){
             NetworkManager.Instance.StartServer(MatchName,Players);
             ToMenu("Lobby");
         }
         
         if(GUI.Button(new Rect(0,33,128,32),"Back")){
             ToMenu("Main");
         }
         MatchName = GUI.TextField(new Rect(130,0,128,32),MatchName);
         GUI.Label(new Rect(260,0,128,32),"Match name");
         Players = Mathf.Clamp(Players,2,8);
         GUI.Label(new Rect(260,32,128,32),"Amount Of Players");
         if (GUI.Button (new Rect (145, 32, 32, 32),"+"))
             Players ++;
         GUI.Label (new Rect (192, 33, 64, 32), Players.ToString());
         if (GUI.Button (new Rect (215, 33, 32, 32),"-"))
             Players --;
     }
     
     private void Lobby(){
         if (Network.isServer)
         {
         if(GUI.Button(new Rect(Screen.width - 128,Screen.height - 64,128,32),"Start"))
             {
                 NetworkManager.Instance.networkView.RPC ("LoadLevel",RPCMode.All);
                 //networkView.RPC("StartServer",RPCMode.All);
                 //NetworkManager.Instance.MatchStarted = true;
             }
         }
         if(GUI.Button(new Rect(Screen.width - 128,Screen.height - 32,128,32),"Back")){
             ToMenu("Main");
             Network.Disconnect();
         }
         
         GUILayout.BeginArea (new Rect(0, 0, Screen.width / 2, Screen.height));
         foreach(NetworkManager.Player pl in NetworkManager.Instance.PlayerList)
         {
             GUILayout.Label(pl.PlayerName);
         }                                
         GUILayout.EndArea ();
     }
     private void MatchList()
     {
         if (GUI.Button(new Rect(0,0,128,32), "Refresh"))
         {
             MasterServer.RequestHostList("Tut");
         }
         if (GUI.Button(new Rect(0,33,128,32), "Back"))
         {
             ToMenu ("Main");
         }
         GUILayout.BeginArea(new Rect(Screen.width/ 2, 0, Screen.width / 2, Screen.height), "Server List","box");
         foreach (HostData hd in MasterServer.PollHostList())
         {
             GUILayout.BeginHorizontal();
             GUILayout.Label(hd.gameName);
             if(GUILayout.Button ("Connect"))
             {
                 Network.Connect(hd);
                 ToMenu("Lobby");
             }
             GUILayout.EndHorizontal();
         }
         GUILayout.EndArea();
     }
 }