Main Menu issues when restart

Hey, I'm using a script that allows me to use an Main Menu ingame but I got a problem with it... when I click on restart the scene restarts fine but the score system doesn't... All the score I've earned doesn't restart when the scene does - I still got the score i had when I died. Could anyone take a look and tell me where I done wrong?

This is the ingame main menu script:

 var guiSkin: GUISkin;
 var nativeVerticalResolution = 700.0;
 var isPaused : boolean = false;
 Screen.showCursor = false;
 
 function Update()
 {
     if(Input.GetKeyDown("escape") && !isPaused)
     {
         print("Paused");
         Time.timeScale = 0.0;
         isPaused = true;
         Screen.showCursor = true;
     }
     else if(Input.GetKeyDown("escape") && isPaused)
     {
         print("Unpaused");
         Time.timeScale = 1.0;
         isPaused = false;    
         Screen.showCursor = false;
     } 
 }
 
 function OnGUI ()
 {
     // Set up gui skin
     GUI.skin = guiSkin;
 
     // Our GUI is laid out for a 1920 x 1200 pixel display (16:10 aspect). The next line makes sure it rescales nicely to other resolutions.
     GUI.matrix = Matrix4x4.TRS (Vector3(0, 0, 0), Quaternion.identity, Vector3 (Screen.height / nativeVerticalResolution, Screen.height / nativeVerticalResolution, 1)); 
 
 
     if(isPaused)
     {
       // RenderSettings.fogDensity = 1;
       if(GUI.Button (Rect((Screen.width)/3,540,200,75), "Quit", "button2"))
       {
          print("Quit!");
          Application.Quit();
       }
       if(GUI.Button (Rect((Screen.width)/3,440,270,75), "Restart", "button2"))
       {
          print("Restart");
          Application.LoadLevel("3");
          Time.timeScale = 1.0;
          isPaused = false;
       }
       if(GUI.Button (Rect((Screen.width)/3,340,310,80), "Main Menu", "button2"))
       {
          print("Main Menu");
          Application.LoadLevel("0");
       }
       if(GUI.Button (Rect((Screen.width)/3,240,270,75), "Continue", "button2"))
       {
          print("Continue");
          Time.timeScale = 1.0;
          isPaused = false;
          Screen.showCursor = false;
       }
    } 
 }
 @script AddComponentMenu ("GUI/Pause GUI")

And this is the score system scripts:

 using UnityEngine;
 using System.Collections;
 
 public class ScorePointCounter : MonoBehaviour
 {
     public GUISkin guiSkin = null;
     public static int points = 0;
 
     void OnGUI()
     {
         GUI.skin = guiSkin;
         GUI.Label(new Rect(0.0f, 0.0f, 700.0f, 500.0f), points.ToString());
         GUI.skin = null;
     }
 }

_

 using UnityEngine;
 using System.Collections;
 
 public class Zombie : MonoBehaviour
 {
     public int points = 1; // You can edit this in the inspector
 
     void OnDestroy()
     {
         ScorePointCounter.points += points;
     }
 }