How To Make GUI Buttons Load/Quit

I'm using This Script.

 var doWindow2 = true;
 
 var mySkin : GUISkin;
 var bgImage : Texture;
 
 private var windowRect2 = Rect (0, 20, 350, 500);
 
 private var scrollPosition0 : Vector2;
 private var scrollPosition1 : Vector2;
 private var HorSliderValue = 0.5;
 private var VertSliderValue = 0.5;
 private var Toggle0 = false;
 private var Toggle1 = false;
 private var Toggle2 = false;
 
 //bringing it all together
 function DoMyWindow2 (windowID : int) 
 {
         GUILayout.Space(8);
         GUILayout.BeginVertical();
         GUILayout.Label("Welcome To Project Infinite");    
         
         GUILayout.Label ("Information.", "HeaderText");
         GUILayout.Label ("Project Infinite Is A One Man Team Attempting The Impossible. Enjoy!", "PlainText");
         GUILayout.Space(8);        
         
         GUILayout.Label ("Are You Ready?", "HeaderText");
         GUILayout.Label ("This Is Just A Test..", "PlainText");
     
         GUILayout.Space(190);
         GUILayout.Label ("Play Or Quit?", "HeaderText");
         GUILayout.BeginHorizontal();
         GUILayout.Button("Play.");        
         GUILayout.Button("Quit.");
         GUILayout.EndHorizontal();
         
         GUILayout.EndVertical();
 
 }
 
 function OnGUI ()
 {
 GUI.skin = mySkin;
 
 GUI.DrawTexture(Rect(0,0,Screen.width,Screen.height), bgImage);  
 
 if (doWindow2)
     windowRect2 = GUI.Window (2, windowRect2, DoMyWindow2, "");
     //now adjust to the group. (0,0) is the topleft corner of the group.
     GUI.BeginGroup (Rect (0,0,100,100));
     // End the group we started above. This is very important to remember!
     GUI.EndGroup ();
 }

How do i make it so when i click Play it will Application.LoadLevel(1) and when i click quit it will do Application.Quit

I thought it would be.

 if (GUILayout.Button ("Play.")) {
     Application.LoadLevel(1);
 }

 if (GUILayout.Button ("Quit.")) {
     Application.Quit;
 }

But these peices of codes create new buttons instead of activation the already exsisting buttons able to do on click.