$form->addInput(array('type'=>'checkbox','name'=>'chtimesheet'));
if ($showApproved)
$form->addInput(array('type'=>'checkbox','name'=>'chapproved'));
$form->addInput(array('type'=>'checkbox','name'=>'chtimesheet'));
if ($showApproved)
$form->addInput(array('type'=>'checkbox','name'=>'chapproved'));