zombie script problem

in this script im having a few problems. 1)zombie stops chasing player after getting close to player 2)animations will not play when supposed to (ex. idle only plays when game starts, zombie walk animation does not play when zombie is walking) 3)zombie does not attack player. can someone help

zombie.js:

var target : Transform; //the enemy's target var moveSpeed = 10; //move speed var rotationSpeed = 9; //speed of turning var attackThreshold = 1.5; // distance within which to attack var chaseThreshold = 10000000; // distance within which to start chasing var giveUpThreshold = 20000; // distance beyond which AI gives up var attackRepeatTime = 1; // delay between attacks when within range

private var chasing = false; private var attackTime = Time.time;

var myTransform : Transform; //current transform data of this enemy

function Awake(){ myTransform = transform; //cache transform data for easy access/preformance }

function Start(){ target = GameObject.FindWithTag("Player").transform; //target the player }

function Update () { // check distance to target every frame: var distance = (target.position - myTransform.position).magnitude; if (chasing) { //rotate to look at the player myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime); //move towards the player myTransform.position += myTransform.forward moveSpeed Time.deltaTime; // give up, if too far away from target: if (distance > giveUpThreshold) { chasing = false; } // attack, if close enough, and if time is OK: if (distance < attackThreshold && Time.time > attackRepeatTime) { target.SendMessage("ApplyDamage",10); // Attack! (call whatever attack function you like here) } if (distance < attackThreshold) { moveSpeed=0; //stop when close enough } attackTime = Time.time+ attackRepeatTime; } else { // not currently chasing. // start chasing if target comes close enough if (distance < chaseThreshold) { chasing = true; } } }

function OnTriggerEnter (other: Collider) { if (other.gameObject.CompareTag("Bullet")){ chaseThreshold=100000000; } }

---

healthbar.cs

 using UnityEngine;

using System.Collections;

public class healthbar : MonoBehaviour { public int maxHealth = 100; public int curHealth = 100;

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 }
 
 void OnGUI() {
     GUI.Box(new Rect(10, 10, Screen.width / 2 / (maxHealth / curHealth), 20), curHealth + "/" + maxHealth);
 }

}