HTML_QuickForm, advcheckbox, setChecked()

Hi -- Would like to know how to pre-check an advanced checkbox. Have searched online PEAR docs ("this element is not documented yet") and the various online tutorials give no joy. My experiment (as follows) does not work; perhaps I am doing something wrong. I instantiate an advanced checkbox element... $element =& HTML_QuickForm::createElement( 'advcheckbox', $elemname, // element name $col['qf_label'], // label null, $col['qf_attrs'], // html attributes $col['qf_vals'] // array(unchecked, checked) ); ... and then attempt to set it as checked ... $element->setChecked(true); ... but although a Var_Dump of the element shows "_attributes['checked'] = checked", the rendered HTML does not show it as checked. Does this have to do with the fact that the advanced-checkbox is not named exactly as requested, but instead prefixed with two underscores, and the field that actually holds the value is a hidden element, with a bit of JavaScript to glue them together? Or am I missing something obvious? How shall I proceed? Thanks. -- Paul M. Jones pmjones@ciaweb.net Savant: the simple alternative to Smarty. http://phpsavant.com/