2d Character runs in place via animator

Ok I'm using the animator to make my 2d sprite to look like hes running on a key press. I FINALLY got him to look like hes running (transition between idle and moving) but now I have the problem of him not going back to the idle animation. I'm not sure if theres a problem with my code, or if theres a setting I need to apply in the animator (exit time and fixed duration are unchecked). Any advice???

 #pragma strict
 
 public var maxJumps = 0; // maximum numer of jumps
 private var numJumps = 0; //number of current jumps
 
 public var moveSpeed = 0;
 
 private var facingRight = true; //initally sprite faces to the right
 
 private var isWalking : boolean;
 
 public var jumpheight = 0;
 
 private var anim : Animator;
 
 function Start() {
 
 anim = GetComponent(Animator);
 
 }
 function Update () {
 
     
     var x:float;
     var y:float; 
 
 
 
 if (Input.GetKeyDown("space") && CanJump()){
     x = GetComponent(Rigidbody2D).velocity.x;
 
     GetComponent(Rigidbody2D).velocity = new Vector2(0, jumpheight);
 
     numJumps ++;
 }
 if (Input.GetKey (KeyCode.A))
  {
      x = GetComponent(Rigidbody2D).velocity.x;
     y = GetComponent(Rigidbody2D).velocity.y;
     GetComponent(Rigidbody2D).velocity = new Vector2(-moveSpeed, y);
     anim.SetFloat("Speed", Mathf.Abs(x));
 
     if (facingRight) {
         Flip();
     
     }
     }
 if (Input.GetKey (KeyCode.D)) {
     x = GetComponent(Rigidbody2D).velocity.x;
     y = GetComponent(Rigidbody2D).velocity.y;
     GetComponent(Rigidbody2D).velocity = new Vector2(moveSpeed, y);
     anim.SetFloat("Speed", Mathf.Abs(x));
 
 
 
 if (!facingRight) {
         Flip();
     
     }
 
 }
 }
 
 
 
 
 function OnCollisionEnter2D (coll : Collision2D)
 {
     if (coll.gameObject.CompareTag("Ground")) {
         numJumps = 0;
     }
     }
     function CanJump() {
     return numJumps < maxJumps;
     }
 
 
     function Flip() {
         var flipScale : Vector3;
         var rigidbody : Rigidbody2D;
 
         rigidbody = GetComponent(Rigidbody2D);
 
         flipScale = rigidbody.transform.localScale;
         flipScale.x *= -1; //flip horizontally
 
         rigidbody.transform.localScale = flipScale;
 
         facingRight = !facingRight; // now facing opposite direction
     }