Enemy AI script

I have a rigged character and several animations that I plan to use as an enemy. The rouble Im having is finding a script that will make the character act as an enemy.

I have found one script that works without the animations but when the enemy targets the player, the enemy flies around the player continuously.

If anyone can help I would really appreciate it.

 var distance;
 var target : Transform;    
 var lookAtDistance = 15.0;
 var attackRange = 10.0;
 var moveSpeed = 5.0;
 var damping = 6.0;
 private var isItAttacking = false;

 function Update () 
 {
 distance = Vector3.Distance(target.position, transform.position);

  if(distance < lookAtDistance)
  {
      isItAttacking = false;
      renderer.material.color = Color.yellow;
      lookAt ();
  }   
  if(distance > lookAtDistance)
  {
      renderer.material.color = Color.green; 
  }
  if(distance < attackRange)
 {
      attack ();
  }
  if(isItAttacking)
  {
      renderer.material.color = Color.red;
  }
  }


 function lookAt ()
 {
  var rotation = Quaternion.LookRotation(target.position - transform.position);
  transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * damping);
 }

 function attack ()
 {
   isItAttacking = true;
   renderer.material.color = Color.red;

   transform.Translate(Vector3.forward * moveSpeed *Time.deltaTime);
 }