C# script works wrong ( GUI ) How to fix it ?

i am a beginner in scripting. i wish everybody can understand what i wrote. if not i will explain everything.

i have gameobjects in hierachy not active. when i press on the button the right menu is opening.

 public GameObject DifficultyMenu;
     public GameObject moregamesmenu;
     public GameObject normallevelmenu;
     public GameObject superiorlevelmenu;
     public GameObject glmenu;
 
     
 
     public bool Play;
     public bool difficulty;
     public bool normal;
     public bool moregames;
     public bool exit;
     public bool back;
     public bool backn;
     public bool backg;
     public bool backs;
     public bool home;
 
     public float width;
     public float height;
     public float hm;
 
     void Update () {
         OnGUI ();
 
     }
     void OnGUI()
     {
         if (GUI.Button (new Rect (Screen.width / width, Screen.height / height * hm, Screen.width/4, Screen.height/2), textura, stil) )
         {
             knopka();
         }
 
     }
     void knopka()
     {  
 
                         if (Play)
         Application.LoadLevel (1);
                               
                         if (difficulty) {
         
                                 DifficultyMenu.SetActive (true);
                                 MainMenu.SetActive (false);
                         }
                         if (normal) 
                         {
                         chekstatusnormal();        
                         }
                         if (superior) 
                         {
                         chekstatussuperior();        
                         }
                         
                         if (moregames) 
                         {
                         moregamesmenu.SetActive (true);
                         MainMenu.SetActive (false);
                         }
         
                         if (back) {
                                 checkstatus ();
                         }
                         if (backn) 
                          {
                         chekstatusabckn();
                         }
                         if (backs) 
                         {
                         chekstatusabcks();
                         } if (backg) 
                         {
                         chekstatusabckg();
                         }
 
                         if (exit) 
                         {
                         Application.Quit ();
                          }
                         if (home)
                         {
                         Application.LoadLevel ("menu");
                         }
 
 
     }   
     void checkstatus()
     {
       if (!MainMenu.activeInHierarchy && DifficultyMenu.activeInHierarchy)
                         MainMenu.SetActive (true);
                          DifficultyMenu.SetActive (false);
     }
     void chekstatusnormal()
     {
         if (!normallevelmenu.activeInHierarchy && DifficultyMenu.activeInHierarchy  )
             normallevelmenu.SetActive (true);
         DifficultyMenu.SetActive (false);
     }
         void chekstatussuperior()
     {
         if (!superiorlevelmenu.activeInHierarchy && DifficultyMenu.activeInHierarchy  )
             superiorlevelmenu.SetActive (true);
         DifficultyMenu.SetActive (false);
     }
     void chekstatusabckn()
     {
         if (!DifficultyMenu.activeInHierarchy && normallevelmenu.activeInHierarchy)
             normallevelmenu.SetActive (false);
         DifficultyMenu.SetActive (true);
     }
     void chekstatusabcks()
     {
         if (!DifficultyMenu.activeInHierarchy && superiorlevelmenu.activeInHierarchy)
             superiorlevelmenu.SetActive (false);
         DifficultyMenu.SetActive (true);
     }
     void chekstatusabckg()
     {
         if (!DifficultyMenu.activeInHierarchy && glmenu.activeInHierarchy)
             glmenu.SetActive (false);
         DifficultyMenu.SetActive (true);
     }