<form class="favourite-form inline"
      action="{{ favourite_url }}"
      method="POST">
  <button type="submit" class="btn favourite-button {% if favourited %}hide{% endif %}">
    <img src="{{ STATIC_URL}}/img/watch-icon.png" alt="Watch" />
  </button>
  <input type="hidden" name="nojs" value="true" />
  {% for pk in packages_ids %}
    <input type="hidden" name="packages[]" value="{{ pk }}" />
  {% endfor %}
</form>

<form class="unfavourite-form inline"
      action="{{ unfavourite_url }}"
      method="POST">
  <button type="submit" class="btn unfavourite-button {% if not favourited %}hide{% endif %}">
    <img src="{{ STATIC_URL}}/img/unwatch-icon.png" alt="Unwatch" />
  </button>
  <input type="hidden" name="nojs" value="true" />
  {% for pk in packages_ids %}
    <input type="hidden" name="packages[]" value="{{ pk }}" />
  {% endfor %}
</form>