buttonHowScript.cs

using UnityEngine;
using System.Collections;

public class buttonHowScript : MonoBehaviour {

	public Texture2D normalTexture;
	public Texture2D hoverTexture;
    public GUITexture startButton;
    public GUITexture aboutButton;
    public GUITexture leaderboardsButton;
    public GUIText titleText;
    public UnityEngine.UI.Text copyrightText;
    public GUITexture howToPlayScreen;
    public GUITexture backToMainButton;

	// Use this for initialization
	void Start () {
        howToPlayScreen.enabled = false;
        backToMainButton.enabled = false;
	}
	
	// Update is called once per frame
	void Update () {
	
	}

	void OnMouseDown() {
		//this.GetComponent<GUITexture>().texture = hoverTexture;
        this.GetComponent<GUITexture>().texture = normalTexture;
        startButton.enabled = false;
        aboutButton.enabled = false;
        leaderboardsButton.enabled = false;
        titleText.enabled = false;
        copyrightText.enabled = false;
        this.GetComponent<GUITexture>().enabled = false;
        howToPlayScreen.enabled = true;
        backToMainButton.enabled = true;
		//Application.LoadLevel("Main");
	}

	void OnMouseEnter()
	{
		this.GetComponent<GUITexture>().texture = hoverTexture;
	}
	void OnMouseExit()
	{
		this.GetComponent<GUITexture>().texture = normalTexture;
	}
}