MenuItem.cs

using UnityEngine;
using System.Collections;

public class MenuItem : MonoBehaviour
{
    public void ToggleHighlight(bool on)
    {
        Vector3 pos = transform.position;
        if (on)
        {
            pos.z = -1.0f;
        }
        else
        {
            pos.z = 0.0f;
        }
        transform.position = pos;
    }
}