Access a Script from Another Scene? "Object Reference not set..."

Hello! I have a Main Menu, and I'm trying to change the skybox and fog in a level if you decide to choose so on the Main Menu. The script for the main menu is here:

     if ( GUI.Button( Rect( 775, 435, 100, 50 ), "$20 Mode!" ) )
     {
         //Set the time back to 1:
         Time.timeScale = 1;
         //Time.timeScale is back to normal, now load the scene:
         Application.LoadLevel( "DayLevel1" );
         var DayLevel = GetComponent(DayLevel); 
         DayLevel.enabled = true;
     }

I have an Empty GameObject with the "DayLevel.js" unchecked

 #pragma strict
 
 public var dayMaterial:Material;
 public var nightMaterial:Material;
 
 function Start () 
 {
     RenderSettings.skybox = nightMaterial;
     //RenderSettings.skybox = dayMaterial;
     RenderSettings.fog = true;
     //RenderSettings.fog = false;
 }
 
 function Awake () {
         DontDestroyOnLoad (transform.gameObject);
     }

I get this error in the console, and the script will not be checked on:

 NullReferenceException: Object reference not set to an instance of an object
 Maps.OnGUI () (at Assets/_Scripts_/Maps.js:40)