require_once 'HTML/QuickForm.php';
$form = new HTML_QuickForm('example');

$form->setDefaults(array('test' => array('4','15')));
$sel =& $form->addElement('hierselect', 'test', 'Test:', null, '/');

$mainOptions = $db->getAssoc('select pkparent, par_desc from parent');

$result = $db->query("select fk_parent, pkchild, chi_desc from child");
while ($result->fetchInto($row)) {
    $secOptions[$row[0]][$row[1]] = $row[2];
}
// Using setMainOptions and setSecOptions is now deprecated 
// use setOptions.

$sel->setOptions(array($mainOptions, $secOptions));

$form->display();

require_once 'HTML/QuickForm.php';
$form = new HTML_QuickForm('example');

$select1[0] = 'Pop';
$select1[1] = 'Classical';
$select1[2] = 'Funeral doom';

// second select
$select2[0][0] = '--- Artist ---';
$select2[0][1] = 'Red Hot Chil Peppers';
$select2[0][2] = 'The Pixies';
      
$select2[1][0] = '--- Artist ---';
$select2[1][1] = 'Wagner';
$select2[1][2] = 'Strauss';
      
$select2[2][0] = '--- Artist ---';
$select2[2][1] = 'Pantheist';
$select2[2][2] = 'Skepticism';
     
// Create a third select with prices for the cds
$select3[0][0][0] = '--- Choose the artist ---';
$select3[0][1][0] = '15.00$';
$select3[0][2][1] = '17.00$';
$select3[1][0][0] = '--- Choose the artist ---';
$select3[1][1][0] = '15.00$';
$select3[1][2][1] = '17.00$';
$select3[2][0][0] = '--- Choose the artist ---';
$select3[2][1][0] = '15.00$';
$select3[2][2][1] = '17.00$';     

// Create the Element
$sel =& $form->addElement('hierselect', 'cds', 'Choose CD:');

// And add the selection options
$sel->setOptions(array($select1, $select2, $select3));

$form->display();