How will i goes fresh level?

Hi All,

I am making simple level passing code. i struck simple problem.

after passing two levels of my game there is a back button. if i comes back the level 1 is not started fresh level. that will continue as same. how will i start fresh if i comes back and goes front also same problem occurs.

How will solve that.

here is my sample code:

 void OnGUI()

 {  
   if(GUI.Button(new Rect(290,Screen.height-160,100,40),"Back"))

        {
         
    Application.LoadLevel(3);
         
         }

   if(GUI.Button(new Rect(290,Screen.height-120,100,40),"Go to Menu"))
  {
    Application.LoadLevel(0);
   }

    if(GUI.Button(new Rect(290,Screen.height-80,100,40),"Quit"))
             {
     Application.Quit();
     }

Second code: For level 3

     void OnGUI (){
    if(GUI.Button(new Rect(240,Screen.height-50,100,40),"Continue to lab"))
        {
      Application.LoadLevel(4);
    }
   if(GUI.Button(new Rect(120,Screen.height-50,100,40),"Go to Menu"))
           {
                Application.LoadLevel(0);
         }
  
 
        }
     }

I found that if i comes back that before level not completely stop. i think that is running in back ground. if i goes front that will execute currently state.

Please Help me

Shankar