public void click()
    {
        GameObject go = GameObject.Find("GameManager");

        mb = (M_Button)go.GetComponent((typeof(M_Button)));
        if (count != 4)
        {
            count = (count + 1) % 4;
            if (count == 0)
            {
                mb.setIcon(id, empty);
            }
            else if (count == 1)
            {
                mb.setIcon(id, x);
            }
            else if (count == 2)
            {
                mb.setIcon(id, check);
            }
            else if (count == 3)
            {
                mb.setIcon(id, question);
            }
        }
        else
        {
            return;
        }
    }
    public void lockSelection(int id)
    {
        GameObject go = GameObject.Find("GameManager");

        mb    = (M_Button)go.GetComponent((typeof(M_Button)));
        count = 4;
        mb.setIcon(id, locked);
    }