Options C# Unity

using UnityEngine;
using System.Collections;

public class Option : MonoBehaviour
{
    private bool openoption = false;
    private bool showsoundslider = false;

    public float buttonWidth = 100;
    public float buttonHeight = 30;

    public float SoundEffect = 5.0f;

    private bool showgraphics = false;
    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
    //tu mam problem
        Antialiasing Ant = gameObject.GetComponentInParent<Antialiasing>();
    //tu mam problem

        // Zaczynamy Wyciszać dźwięki
        AudioSource As = gameObject.GetComponent<AudioSource>();

        if (SoundEffect < 5.0f)
        {
            As.volume = 0.8f;
        }
        else if (SoundEffect == 5.0f)
        {
            As.volume = 1.0f;
        }

        if (SoundEffect < 4.0f)
        {
            As.volume = 0.6f;
        }
        else if (SoundEffect == 4.0f)
        {
            As.volume = 0.8f;
        }

        if (SoundEffect < 3.0f)
        {
            As.volume = 0.4f;
        }
        else if (SoundEffect == 3.0f)
        {
            As.volume = 0.6f;
        }

        if (SoundEffect < 2.0f)
        {
            As.volume = 0.2f;
        }
        else if (SoundEffect == 2.0f)
        {
            As.volume = 0.4f;
        }

        if (SoundEffect < 1.0f)
        {
            As.volume = 0.0f;
        }
        else if (SoundEffect == 1.0f)
        {
            As.volume = 0.2f;
        }
        // Kończymy Wyciszać Dzwięki
    }
    void OnGUI()
    {
        if (GUI.Button(new Rect(50, 400, buttonWidth, buttonHeight), "Opcje"))
        {
            openoption = !openoption;
        }
        if (openoption)
        {
            if (GUI.Button(new Rect(700, 400, buttonWidth, buttonHeight), "Graficzne"))
            {
                showgraphics = !showgraphics;
            }

            if (GUI.Button(new Rect(400, 400, buttonWidth, buttonHeight), "Dzwięki"))
            {
                showsoundslider = !showsoundslider;

            }
            if (showsoundslider)
            {
                SoundEffect = GUI.VerticalSlider(new Rect(400, 500, 30, 100), SoundEffect, 5.0F, 0.0F);
                GUI.Label(new Rect(420, 490, 10, 160), "Muzyka");
            }
            if (showgraphics)
            {
                GUI.Label(new Rect(700, 460, 100, 50), "Jakość :");
                if (GUI.Button(new Rect(770, 460, 100, 30), "Niska"))
                {

                }

                if (GUI.Button(new Rect(870, 460, 100, 30), "Wysoka"))
                {

                }
            }
        }
    }
}