Custom render a Zend Form MultiCheckbox element with a viewscript

multicheckbox.php

$audience = new Zend_Form_Element_MultiCheckbox('audience', array(
        'label' => 'Target Audience',
        'required' => true,
        'multiOptions' => array(
            'students' => 'Students',
            'faculty' => 'Faculty',
            'staff' => 'Staff',
            'stustaf' => 'Student Employees',
            'retiree' => 'Emeritus/Retiree'),
        'validators' => array(
            array('NotEmpty', true, array(
                'messages' => array(
                    'isEmpty' => 'You must select at least one target audience.'
                )
            ))
        ),
        'decorators' => array(
            'Errors',
            array('ViewScript', array('viewScript'=>'multicheckboxview.php'))
        )
    ));

multicheckboxview.php

<?php
    $elem = $this->element;
    $elemName = $elem->getName();
    $values = $elem->getValue();
?>

<ul class="condensed">
<?php foreach($elem->getMultiOptions() as $option=>$value){ ?>
    <li>
        <input type="checkbox" name="<?php echo $elemName; ?>[]" id="<?php echo $elemName; ?>-<?php echo $option; ?>" value="<?php echo $option; ?>" <?php if($values && in_array($option, $values)){ echo ' checked="checked"'; }?> />
        <label for="<?php echo $elemName; ?>-<?php echo $option; ?>">
            <?php echo $value; ?>
        </label>
    </li>
<?php } ?>
</ul>

thank you!