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<form action="[% cgi_url %]" method="get">
  <input type="hidden" name="action" value="index" />
  [% IF centre_lat OR no_nodes_on_map %]
    [%# this is how we know we're doing format=map! %]
    <input type="hidden" name="format" value="map" />
  [% END %]
  [% FOREACH field = index_form_fields %]
    [% field.type.ucfirst | html %]:
    [% field.html %]
  [% END %]
  <input type="submit" value="Search" />
</form>