Unity GUI button to Pause and Rewind MovieTexture

Question

Currently, I can get my movie player to pause and rewind if I press P and the spacebar, but how can I apply it to a Unity GUI button instead of pressing P and the spacebar? I'm trying to recreate a touchscreen using Unity 5.2, so no keyboard will be require.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

[RequireComponent (typeof(AudioSource))]

public class MoviePlayer : MonoBehaviour {


    public MovieTexture movie;
    private AudioSource audio;

    void Start ()
    {
        GetComponent<RawImage>().texture = movie as MovieTexture;
        audio = GetComponent<AudioSource>();
        audio.clip = movie.audioClip;

        movie.Play();
        audio.Play();

    }
    void Update ()
    {
        if (Input.GetKeyDown(KeyCode.P) && movie.isPlaying)
        {
            movie.Pause();
        }
        else if (Input.GetKeyDown(KeyCode.P) && !movie.isPlaying)
        {
            movie.Play();
        }

        else if (Input.GetKeyDown(KeyCode.Space))
        {
            movie.Stop();
            movie.Play();
        }

    }
}