{% if form_submit %}
    <form action='{{ url }}' method='post'>
        <input type='hidden' name='cart' value='{{ cart }}' />
        <input type='hidden' name='signature' value='{{ signature }}' />
        <input type="image" name="Google Checkout" alt="Fast checkout through Google" src="{{ image_url }}" height="46" width="180">
    </form>
{% else %}
    <a href='{{ dest_url }}'><img src='{{ image_url }}'/></a>
{% endif %}