Menu Selection using 360 Controller

I would like the menu buttons to be able to be scrolled through and selected by using the 360 controller instead of the mouse cursor. i am using a 3D menu for the main menu and a delegate menu in a pause menu. If possible I would like to do this for both. I am using C# so please answer it with C# script instead of Javascript.

this is a what i have in the Delegate Menu so far.

 using UnityEngine;

using System.Collections;

public class DelegateMenu : MonoBehaviour { private delegate void MenuDelegate(); private MenuDelegate menuFunction;

 private float screenHeight;
 private float screenWidth;
 private float buttonHeight;
 private float buttonWidth;



 // Use this for initialization
 void Start()
 {
     screenHeight = Screen.height;
     screenWidth = Screen.width;

     buttonHeight = screenHeight * 0.3f;
     buttonWidth = screenWidth * 0.4f;

     menuFunction = anyKey;


 }

 void OnGUI()
 {
     menuFunction();
 }
 void anyKey()
 {
     if (Input.anyKey)
     {
         menuFunction = mainMenu;
     }
     GUI.skin.label.alignment = TextAnchor.MiddleCenter;

     GUI.Label(new Rect(screenWidth * 0.45f, screenHeight * 0.1f, screenWidth * 0.1f, screenHeight * 0.1f), "Press any key to continue");

 }

 void mainMenu()
 {
     if (GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.1f, buttonWidth, buttonHeight), "Start Game"))
     {
         Application.LoadLevel("Level1");
     }

     if (GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.5f, buttonWidth, buttonHeight), "Quit Game"))
     {
         Application.Quit();
     }

 }

and this is what i have for the 3D menu:

 using UnityEngine;

using System.Collections;

public class MenuObject : MonoBehaviour { public bool isQuit = false; void OnMouseEnter() { renderer.material.color = Color.red;

 }

 void OnMouseExit()
 {
     renderer.material.color = Color.white;

 }

 void OnMouseDown()
 {
     if (isQuit)
     {
         Application.Quit();
     }
     else
     {
         Application.LoadLevel(2);
     }
 }

 

}

}enter code here