Spectator Menu creator.

/**
  Creates and opens a spectator menu.
  @param player The player.
*/
public void openMenu(Player player) {
    int cells = Math.min(((Bukkit.getOnlinePlayers().length - 2) / 9) * 9 + 9, 54);
    Inventory panel = Bukkit.createInventory(null, cells, "Spectator Menu");

    List<ItemStack> heads = new ArrayList<ItemStack>();

    for (Player p : Bukkit.getOnlinePlayers()) {
        if (equals(p) || p.getGameMode() != GameMode.SURVIVAL)
            continue;

        ItemStack head = new ItemStack(Material.SKULL_ITEM);

        SkullMeta hMeta = (SkullMeta) head.getItemMeta();
        hMeta.setOwner(p.getName());

        hMeta.setDisplayName(p.getName());

        List<String> lore = new ArrayList<String>();
        lore.add("");
        lore.add("§7§oRight Click to teleport!");
        hMeta.setLore(lore);

        head.setItemMeta(hMeta);
    }

    for (ItemStack h : heads)
        panel.addItem(h);

    getPlayer().openInventory(panel);
}