js.php

<?php

function template_preprocess_page(&$variables) {

  $google_simple_api_access_key = variable_get('google_simple_api_access_key');
  drupal_add_js(array(
    'google_simple_api_access' => array(
      'key' => $google_simple_api_access_key,
    ),
  ),
  'setting'
  );

}