Idle , Move and Attack animations

I want the enemy to idle , follow , and attack the player . The thing is I want the enemy to use it's move animation when following the player , and use the attack animation when the player is in distance , and ldle back when the player is dead . I am having some problems. Here is my java script :

var other : Transform;

function Start () {

}

function Update () { var distance = Vector3.Distance(transform.position, other.transform.position); GetComponent.Animation.Play("attack");

}