<?php

sfLoader::loadHelpers(array('stProduct'), 'stProduct');

$cache = new stFunctionCache('stTax');

$tax_info = $cache->cacheCall('_object_product_tax_helper');

st_price_tax_managment_init(array(
        'taxField' => 'group_price_tax_id',
        'taxValues' => $tax_info['values'],
        'priceFields' => array(
                array('price' => 'group_price_price_netto', 'priceWithTax' => 'group_price_price_brutto'),
                array('price' => 'group_price_old_price_netto', 'priceWithTax' => 'group_price_old_price_brutto'),
        
        ))); 

echo select_tag('group_price[tax_id]', options_for_select($tax_info['names'], $group_price->getTaxId() ? $group_price->getTaxId() : $tax_info['default']));