Need help with javascript AI

hello, I took an AI script from an other topic around here and I saw that the "zombies" merge together and that is unwanted, I added a function "Stay away" but I don't know what to do.

If you have any other ideas, feel free to speak of them.

 var player : GameObject; 

var otherzombie : GameObject;

var speed : float=6f;

var range : float=15f;

var hitRange : float=6f;

var separationRange : float=3;

var enemyDamage : float=10f;

var rotationSpeed : float=5f;

var damageTimer : float=0f;

var delta : Vector3;

var distance;

var distancefromzombie;

function Start()

{

 player = GameObject.FindGameObjectWithTag("1Player");

}

function Update()

{

 //calculate the enemy's distance from player and do a check to see if we should 

     //progress then call the necessary methods



 distance = Vector3.Distance(transform.position, otherzombie.transform.position);

 if(distance<=range)

 {    

     MoveTowards();

     RotateTowards();

     AttackPlayer();

 }

 

 distancefromzombie = Vector3.Distance(transform.position, player.transform.position);

 if(distancefromzombie<=separationRange)

 {

     StayAway();

 }

}

function MoveTowards()

{

 delta = player.transform.position - transform.position;

 delta.Normalize();

 delta.y = 0;

 if(distance<=(hitRange/1.5))

 {

     return;

 }

 var moveSpeed = speed * Time.deltaTime;

 transform.position = transform.position + (delta * moveSpeed);

}

function RotateTowards()

{

 transform.rotation = Quaternion.RotateTowards (transform.rotation, Quaternion.LookRotation(delta), rotationSpeed);

 transform.rotation = Quaternion.Euler(0, transform.eulerAngles.y, 0);

}

function AttackPlayer()

{

 damageTimer+=Time.deltaTime;

 if (distance < hitRange && damageTimer>=1.5)

 {

     damageTimer=0f;

     player.SendMessageUpwards

     ("ApplyDamage", enemyDamage, SendMessageOptions.DontRequireReceiver);

 }

}

function StayAway()

{

}

Regards

Furdak