I want to load the next level from array!

I made something like this :-

function OnTriggerEnter (other : Collider) {    
    if(other.gameObject.CompareTag("End")) {
        yield WaitForSeconds(1);
        Application.LoadLevel(1);
      }
}

It loaded the 2nd level. But when in the 2nd level, it doesn't load the 3rd level as i needed. But it loaded the 2nd level again. How do i do as i wanted ?