Try not to use single quotes for variables. Like this:
This is my snippet
how to pass the argument for the form function ,
Below is the sample one, but not working,can u make it work,
$output[] .=drupal_get_form('username_form','$usernameID','$username');
function username_form(&$node, $form_values){$form['userName'] = array('#type' => 'select','#title' => t('User Name'),'#options' => array($usernameID => '$username',),'#default_value' => '1','#description' => t(''),'#required' => TRUE);return $form;
}