EDIT

  // ----------------------

  $form['cdm_js_devel_mode'] = array(

      '#type' => 'checkbox',

      '#title' => 'Java-script developer mode',

      '#default_value' => variable_get('cdm_js_devel_mode', FALSE),

      '#description' => 'In production envirionments the java script libraries

      the cdm_dataportal is making use of are compressed and optimized. This

      is good for performance but a caveat if you need to debug java-script. When the

      java-script developer mode is enabled the uncompressed and commented developer

      versions of java-script libraries will be used where possible.

      <br/><strong>Do not use this option in production!</strong>'

  );