Mecanim Enemy AI Script help???

I searched and searched and found similar unanswered questions. I would like to use the Mecanim to animate my AI. I have an AI script but its not working. I found this script and changed what the enemy did. Originally it turned colors only, so I added animation to it instead but I think I did it wrong. Please help. (I have a character controller and an animator controller with these animations on it. attached to my enemy also)

     var Distance;
 var Target : Transform;
 var lookAtDistance = 25.0;
 var chaseRange = 15.0;
 var attackRange = 1.5;
 var moveSpeed = 5.0;
 var Damping = 6.0;
 var attackRepeatTime = 1;
 
 var TheDammage = 40;
 
 private var attackTime : float;
 
 var controller : CharacterController;
 var gravity : float = 20.0;
 private var MoveDirection : Vector3 = Vector3.zero;
 
 function Start ()
 {
     attackTime = Time.time;
     animation.Play("idle01");
 }
 
 function Update ()
 {
     if(RespawnMenuV2.playerIsDead == false)
     {
         Distance = Vector3.Distance(Target.position, transform.position);
         
         if (Distance < lookAtDistance)
         {
             lookAt();
         }
         
         if (Distance > lookAtDistance)
         {
             animation.Play("walk02");
             //renderer.material.color = Color.green; //this worked
         }
         
         if (Distance < attackRange)
         {
             animation.Play("attack01");
             //attack();
         }
         else if (Distance < chaseRange)
         {
             animation.Play("run");
             //chase ();
         }
     }
 }
 
 function lookAt ()
 {
     animation.Play("caution");
     //renderer.material.color = Color.yellow; //this worked
     var rotation = Quaternion.LookRotation(Target.position - transform.position);
     transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);
 }
 
 function chase ()
 {
     animation.Play("run");
     //renderer.material.color = Color.red; // this worked
     
     moveDirection = transform.forward;
     moveDirection *= moveSpeed;
     
     moveDirection.y -= gravity * Time.deltaTime;
     controller.Move(moveDirection * Time.deltaTime);
 }
 
 function attack ()
 {
     if (Time.time > attackTime)
     {
         Target.SendMessage("ApplyDammage", TheDammage);
         Debug.Log("The Enemy Has Attacked");
         attackTime = Time.time + attackRepeatTime;
     }
 }
 
 function ApplyDammage ()
 {
     chaseRange += 30;
     moveSpeed += 2;
     lookAtDistance += 40;
 }