Here we are, a single fieldset which includes the submit button too. It's really easy, just set the "submit" parameter to 1 for the fieldset element!
Below are the dumps of some PHP variables - submit the form to see the changes!
Contents of the $_POST array:
$_POST = array (
)
Results of a $clonefish->getElementValues() call: array ( 'inputText' => NULL, 'inputPassword' => NULL, 'textarea' => NULL, 'inputHidden' => 'something you don\'t want the users to see', 'id' => 'fieldset2', )