How to disable LockTexture in case of LEVEL UNLOCK SYSTEM IN UNITY?

am building a game consist of 8 level. I use the following script to switch next level. But when i unlock a level the Lock Texture still remain in the window. I want to remove the lock texture when i unlock a new level. Please help me out. Thanks in advance. The full script is look like this:

     var TitleText:String = "SINGLE PLAYER";
     var NumberOfPlayers:int = 1;
 
     var Levels:int = 8;
     private var LevelIndex:int = 0;
 
     var PointsToUnlock:Array = new Array(0, 2, 6, 12, 24, 36, 48, 56);
 
     var LevelsGrid:Vector2 = Vector2(4,2);
     private var GridIndexA:int = 0;
     private var GridIndexB:int = 0;
 
     var LevelTexture:Texture2D;
     var LockTexture:Texture2D;
 
     //~ var HowToPlayTexture:Texture2D;
     var BGPattern:Texture2D;
 
     //This script displays the HUD, with current weapon, ammo left, Health, Shield, and score
     var GUIskin:GUISkin; //The skin gui we'll use
 
     private var LevelPoints:Array = new Array();
     private var TotalPoints:int = 0;
 
     function Start()
     {
         if ( camera.main.GetComponent("StartMenu") )
             camera.main.GetComponent("StartMenu").MenuLevel = transform;
         else if ( camera.main.GetComponent("EndMenu") )
             camera.main.GetComponent("EndMenu").MenuLevel = transform;
         
         LevelPoints.Clear();
         
         for ( LevelIndex = 1 ; LevelIndex <= transform.GetComponent("LevelsMenu").Levels ; LevelIndex++ )
         {
             LevelPoints.Push(PlayerPrefs.GetInt(("level" + LevelIndex + "Points").ToString()));
         
             TotalPoints += LevelPoints[LevelIndex - 1];
         }
         
         print(LevelPoints);
         print(TotalPoints);
     }
 
     function OnGUI()
     {
         GUI.skin = GUIskin; //The skin gui we'll use
         GUI.depth = 0;
         
         GUI.DrawTexture(Rect( 0, 0 ,Screen.width, Screen.height), BGPattern);//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
         
         GUI.Label(Rect(0, 10, Screen.width, 70), TitleText);
         
         LevelIndex = 0;
         
         for ( GridIndexB = 0 ; GridIndexB < LevelsGrid.y ; GridIndexB++ )
         {
             for ( GridIndexA = 0 ; GridIndexA < LevelsGrid.x ; GridIndexA++ )
             {
                 LevelIndex++;
                 
                 GUI.DrawTexture(Rect( (Screen.width - LevelsGrid.x * (LevelTexture.width + 10)) * 0.5 + GridIndexA * (LevelTexture.width + 10), 60 + GridIndexB * (LevelTexture.height + 10) ,LevelTexture.width, LevelTexture.height), LevelTexture);//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
                 
                 if ( TotalPoints >= PointsToUnlock[LevelIndex - 1] )
                 {
                     if ( GUI.Button(Rect( (Screen.width - LevelsGrid.x * (LevelTexture.width + 10)) * 0.5 + GridIndexA * (LevelTexture.width + 10), 60 + GridIndexB * (LevelTexture.height + 10), LevelTexture.width, LevelTexture.height), LevelIndex.ToString()) )//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
                     {
                         PlayerPrefs.SetInt("currentLevel", LevelIndex); 
                         Application.LoadLevel("level" + LevelIndex);
                         
                     }
                 }
                 else
                 {
                     GUI.DrawTexture(Rect( (Screen.width - LevelsGrid.x * (LevelTexture.width + 10)) * 0.5 + GridIndexA * (LevelTexture.width + 10), 60 + GridIndexB * (LevelTexture.height + 10), LevelTexture.width, LevelTexture.height), LockTexture);
                 }
             }
         }
         
         if ( GUI.Button(Rect( 10, Screen.height - 70, 140, 60), "BACK") )//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
         {
             if ( camera.main.GetComponent("StartMenu") )
                 camera.main.GetComponent("StartMenu").MenuLevel = camera.main.transform;
             else if ( camera.main.GetComponent("EndMenu") )
                 camera.main.GetComponent("EndMenu").MenuLevel = camera.main.transform;
                 
             Destroy(gameObject);
         }
         
         if ( GUI.Button(Rect( Screen.width - 410 , Screen.height - 70, 400, 60), "RESET LEVELS") )//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
         {
              LevelPoints.Clear();
             
              for ( LevelIndex = 1 ; LevelIndex <= transform.GetComponent("LevelsMenu").Levels ; LevelIndex++ )
              {
                  PlayerPrefs.SetInt(("level" + LevelIndex + "Points").ToString(), 0);
              }
             
             //~ TotalPoints = 0;
         }
     }

I am going to make it easy for you. I just need a simple line of code in the following loop where i can disable LockTexture when new level come up.

 LevelIndex = 0;
 
     for ( GridIndexB = 0 ; GridIndexB < LevelsGrid.y ; GridIndexB++ )
     {
         for ( GridIndexA = 0 ; GridIndexA < LevelsGrid.x ; GridIndexA++ )
         {
             LevelIndex++;
 
             GUI.DrawTexture(Rect( (Screen.width - LevelsGrid.x * (LevelTexture.width + 10)) * 0.5 + GridIndexA * (LevelTexture.width + 10), 60 + GridIndexB * (LevelTexture.height + 10) ,LevelTexture.width, LevelTexture.height), LevelTexture);//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
 
             if ( TotalPoints >= PointsToUnlock[LevelIndex - 1] )
             {
                 if ( GUI.Button(Rect( (Screen.width - LevelsGrid.x * (LevelTexture.width + 10)) * 0.5 + GridIndexA * (LevelTexture.width + 10), 60 + GridIndexB * (LevelTexture.height + 10), LevelTexture.width, LevelTexture.height), LevelIndex.ToString()) )//Laps.ToString() + "/" + GameController.GetComponent("GameController").LapsToWin.ToString()); //Draw the HUD texture
                 {
                     PlayerPrefs.SetInt("currentLevel", LevelIndex); 
                     Application.LoadLevel("level" + LevelIndex);
 
                 }
             }
             else
             {
                 GUI.DrawTexture(Rect( (Screen.width - LevelsGrid.x * (LevelTexture.width + 10)) * 0.5 + GridIndexA * (LevelTexture.width + 10), 60 + GridIndexB * (LevelTexture.height + 10), LevelTexture.width, LevelTexture.height), LockTexture);
             }
         }
     }