How to create slider for control video playback on movie texture?

using UnityEngine; using System.Collections;

[RequireComponent (typeof(AudioSource))] public class GUIButton02 : MonoBehaviour {

 public MovieTexture movTexture;
 public Texture2D buttonImage1 = null;
 public Texture2D buttonImage2 = null;
 public Texture2D buttonImage3 = null;
 public float hSliderValue =0.0f;    
 const int orthographicSizeMin = 1;
 const int orthographicSizeMax = 7;
 
 private void OnGUI(){
     if (GUI.Button (new Rect (320, 530, 30, 30), buttonImage1)) {
         renderer.material.mainTexture = movTexture;
         audio.clip = movTexture.audioClip;

         audio.Play();
         movTexture.Play();
     }
     if (GUI.Button (new Rect (360, 530, 30, 30), buttonImage2)) {
         movTexture.Pause();
     }
     if (GUI.Button (new Rect (400, 530, 30, 30), buttonImage3)) {
         movTexture.Stop();
     }
     hSliderValue = GUI.HorizontalSlider (new Rect (450, 540, 600, 30), hSliderValue, 0.0f, 10.0f);

     Camera.main.orthographicSize = Mathf.Clamp(Camera.main.orthographicSize, orthographicSizeMin, orthographicSizeMax );
 }

}

that's my script.. anyone can help me? how to create horizontal slider for control movie texture.. thx before..