var animOpen : AnimationClip;  
var animClose : AnimationClip;  
var soundOpen : AudioClip;  
var soundClose : AudioClip;  
private var open = 1;  
private var close = 0;  

function OnTriggerEnter (other : Collider) {  
         if (open == 1)  {  
        open = 0;  
           Open ();  
        }  
}  

function OnTriggerExit (other : Collider) {  
         if (close == 1)  {  
        close = 0;  
        Close ();  
        }  
}  
function Open ()  {  
        audio.clip = soundOpen;  
        audio.Play();  
        animation.clip = animOpen;  
        animation.Play();  
        yield WaitForSeconds (animation.clip.length);  
        close = 1;  
}  
function Close ()  {  
        audio.clip = soundClose;  
        audio.Play();  
        animation.clip = animClose;  
        animation.Play();  
        yield WaitForSeconds (animation.clip.length);  
        open = 1;  
}