Rotating an object whenever the X value decreases and increases.

hey guys! i'm new to unity and i'm trying to rotate my object whenever the X value decreases and increases. I've already created the random motion script, I just can't figure out how to create a script which will let me rotate my image.

{ Vector3 temppos;

 // Use this for initialization
 void Start () 
 {
 
 }
 
 // Update is called once per frame
 void Update () 
 {
     temppos = transform.position;
     if (temppos.x > temppos.x )
         transform.eulerAngles = new Vector2 (0, 0);
     if (temppos.x < temppos.x )
         transform.eulerAngles = new Vector2 (0, 180);
     transform.position = temppos;
 }

}