取得magento simple product的custom option信息

$product= Mage::getModel('catalog/product')->load(174);
$i= 1;
    echo"<pre>";
    foreach($product->getOptions()as$o) {
        echo"<strong>Custom Option:" . $i. "</strong><br/>";
        echo"Custom Option TYPE: " . $o->getType() . "<br/>";
        echo"Custom Option TITLE: " . $o->getTitle() . "<br/>";
        echo"Custom Option Values: <br/>";
        // Getting Values if it has option values, case of select,dropdown,radio,multiselect
        $values= $o->getValues();
        foreach($valuesas $v) {
                print_r($v->getData());
        }
        $i++;
 
        echo"----------------------------------<br/>";
    }