D7 hook_form_alter help

Hello again,

I've come across a roadblock attempting to modify the user forms using hook_form_alter in Drupal 7.
$form_id is empty.
I don't know why either version fails. Any pointers would be great.

function cg_volunteer_form_alter(&$form_id, &$form) {
$cg_stuff = array();
if ($form_id == 'user_profile_form') {
$cg_stuff['user']['cg_first_name'] = array (
'form' => array(
'#type' => 'textfield',
'#title' => t('demo'),
'#size' => 10,
),
);
};

if ($form_id == 'user_register_form') {
$cg_stuff['user']['cg_first_name']= array (
'#type' => 'textfield',
'#title' => t('demo'),
'#description' => t('Great effort!'),
'#size' => 20,
);
}
watchdog('cg_volunteer', 'cg form_alter has run %formly', array('%formly' => $form_id), WATCHDOG_NOTICE, $link = NULL);

return $cg_stuff;
};