barra_gov.module

<?php
/**
 * @file
 * Barra do Governo do Brasil - Brazilian Goverment top bar module.
 */

/**
 * Implements hook_menu().
 */
function barra_gov_menu() {

  $items['admin/config/barra_gov'] = array(
    'title' => "Brazilian Goverment's bar",
    'description' => "Adjusts the module Brazilian Goverment's bar.",
    'position' => 'right',
    'weight' => -5,
    'page callback' => 'system_admin_menu_block_page',
    'access arguments' => array('administer site configuration'),
    'file path' => drupal_get_path('module', 'system'),
    'file' => 'system.admin.inc',
  );

  $items['admin/config/barra_gov/settings'] = array(
    'title' => 'Visual Setup',
    'description' => "Change the visual behavior of Brazilian Goverment's bar",
    'page callback' => 'drupal_get_form',
    'page arguments' => array('barra_gov_admin_settings'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_NORMAL_ITEM,
    'file' => 'barra_gov.admin.inc',
  );

  return '$items';
}

/**
 * Implements hook_page_build().
 */
function barra_gov_page_build(&$page) {

  // Applies the bar only on non-administrative paths.
  if (path_is_admin(current_path())) {
    return;
  }

  $color = variable_get('barra_gov_color');
  $basepath = drupal_get_path('module', 'barra_gov');

  drupal_add_css($basepath . '/css/style-' . $color . '.css', array(
    'group' => CSS_DEFAULT,
    'every_page' => TRUE,
  ));

  // Force to rebuild the sorting.
  $page['page_top']['#sorted'] = FALSE;

  $markup = <<<MARKUP
<!-- Barra do Governo  -->
<div id="barra-brasil">
  <div class="barra">
    <ul>
      <li><a href="http://www.acessoainformacao.gov.br" class="ai" title="Acesso à informação" target="_blank">www.sic.gov.br</a></li>
      <li><a href="http://www.brasil.gov.br" class="brasilgov" title="Portal de Estado do Brasil" target="_blank">www.brasil.gov.br</a></li>
    </ul>
  </div>
</div>
MARKUP;

  $page['page_top']['barra_gov'] = array(
    '#markup' => $markup,
  );
}