publik-base-theme/static/dordogne-cd24/extra.js

$(function() {
  $('div.contact-commune select').on('change', function() {
    var $parent = $(this).parent();
    $parent.find('> div').hide();
    $parent.find('div#commune-' + this.value).show();
  });
  $('div.contact-commune select').trigger('change');
});