Utilize Libraries API

From looking at - http://drupal.org/update/modules/6/7#drupal_add_library

Looks like we should be using more code like:

function openlayers_include() {
  // Use a static variable to prevent running URL check code repeatedly.
  static $once;
  if (!isset($once)) {
    $once = TRUE;

  drupal_add_library('openlayers', 'main-config');
  }
}


/**
 * Include necessary CSS and JS for rendering maps
 *
 * @ingroup openlayers_api
 */
function openlayers_library() {
    $path = check_plain(variable_get('openlayers_source', OPENLAYERS_DEFAULT_LIBRARY));
    // Check for full URL and include it manually if external.
    if (valid_url($path, TRUE)) {
      $openlayers_source_array => ('type' => 'external');
    }
    else {
       $openlayers_source_array = array();
    }

  $libraries['main-config'] = array(
    'title' => 'Main Configuration Files',
    'js' => array(
      $path => $openlayers_source_array,
    ),
    'js' => array(
      'js/openlayers.js' => array(),
    ),
    'css' => array(
      'js/openlayers.cs' => array(),
    ),
  );
  return $libraries;
}