Disable gameobject at other screen with code ?

Hello, I've got 2 scenes, When i press Home Button, The Camera in homebutton should be disabled and second camera should be enabled ? I'm using Prefab method for this but, It didn't work :( So what shall i do ? here's my code ;

 #pragma strict
 
 var mainCam : GameObject;
 var Logo : GameObject;
 
 function Start () {
 
 }
 
 function OnMouseEnter () {
 
     mainCam.active = false;
     Logo.active = true ;
     Application.LoadLevel(1);
 
 }

when I turn variables to "Static" then, I can't define Which camera is the object :( So help me please..