#urls.py
urlpatterns = patterns('fields.views',
    # Examples:
    # url(r'^$', 'datafield.views.home', name='home'),
    # url(r'^blog/', include('blog.urls')),
    url(r'^admin/', include(admin.site.urls)),
    url(r'^', 'index', name='index'),
    url(r'^purchase/$', 'purchase', name='purchase'),
    
)

#views.py
def purchase(request):
    return render_to_response('purchase.html')

#purchase.html
{% extends 'index.html' %}
{% load staticfiles %}
{% block purchase %}
        <!--Main part Start-->
            <!--Ads-->
            <section id="homepage-ads">
                <div class="row">
                </div>
            </section>
            <!--Main Content-->
            <section id="homepage-about">
                <div class="row centered-text">
                    <div class="large-12 columns">
                        <h2>Purchase</h2>
                    </div>
                </div>
            </section>
{% endblock %}

#index.html
 <!-- Left top-bar menu-->
                <ul class="right">
                    <li class="divider"></li>
                    <li>
                       <a href="/">How to Use</a>
                    </li>
                    <li class="divider"></li>
                    <li>
                        <a href='{% url 'purchase' %}'>Purchase</a> #ссылка на переход по кнопке на                          #страницу покупок
                    </li>
                    <li class="divider"></li>
                    <li class="has-form">
                        <a href="/" class="button">Sign In</a>
                    </li>
                </ul>
            </section>
            </nav>
        </div>
          {% block main %} {% endblock %}
          {% block purchase %} {% endblock %}
        <!--Footer Start-->

url(r'^', 'index', name='index'),

url(r'^$', 'index', name='index'),