When Player Collides With Mesh Collider Enable Reverb

I have a gym area in my game and wanted to add reverb to the room. he code i have for the player works but not for the collider.

Code (JavaScript):

1. var TheDistance : float = GymDis.DistanceToTarget;
2.  
3.  
4. function Update () {
5.         if (TheDistance == 1)
6.         {
7.             GetComponent.<AudioReverbZone>().enabled = true;
8.         }
9.         else if (TheDistance == 0)
10.         {
11.             GetComponent.<AudioReverbZone>().enabled = false;
12.         }
13. }

Code (JavaScript):

1. static var DistanceToTarget : float;
2.  
3. var toTarget : float;
4.  
5. function OnTriggerEnter (col : MeshCollider) {
6.      if(col.gameObject.CompareTag("Player"))
7.      {
8.      DistanceToTarget = 1;
9. }
10. }

i don't have an exit function yet