<?php // no direct access
defined('_JEXEC') or die('Restricted access'); ?>

<!-- Currency Selector Module -->
<?php echo $text_before ?>
<form action="<?php echo JURI::getInstance()->toString(); ?>" method="post">
    <br />
    <?php echo JHTML::_('select.genericlist', $currencies, 'virtuemart_currency_id', 'class="inputbox"', 'virtuemart_currency_id', 'currency_txt', $virtuemart_currency_id); ?>
    <input class="button" type="submit" name="submit" value="<?php echo JText::_('MOD_VIRTUEMART_CURRENCIES_CHANGE_CURRENCIES') ?>" />
</form>

public static function genericlist($data, $name, $attribs = null, $optKey = 'value', $optText = 'text', $selected = null, $idtag = false,
        $translate = false)
    {
        // Set default options
        $options = array_merge(JHtml::$formatOptions, array('format.depth' => 0, 'id' => false));
        if (is_array($attribs) && func_num_args() == 3)
        {
            // Assume we have an options array
            $options = array_merge($options, $attribs);
        }
        else
        {
            // Get options from the parameters
            $options['id'] = $idtag;
            $options['list.attr'] = $attribs;
            $options['list.translate'] = $translate;
            $options['option.key'] = $optKey;
            $options['option.text'] = $optText;
            $options['list.select'] = $selected;
        }
        $attribs = '';
        if (isset($options['list.attr']))
        {
            if (is_array($options['list.attr']))
            {
                $attribs = JArrayHelper::toString($options['list.attr']);
            }
            else
            {
                $attribs = $options['list.attr'];
            }
            if ($attribs != '')
            {
                $attribs = ' ' . $attribs;
            }
        }

        $id = $options['id'] !== false ? $options['id'] : $name;
        $id = str_replace(array('[', ']'), '', $id);

        $baseIndent = str_repeat($options['format.indent'], $options['format.depth']++);
        $html = $baseIndent . '<select' . ($id !== '' ? ' id="' . $id . '"' : '') . ' name="' . $name . '"' . $attribs . '>' . $options['format.eol']
            . self::options($data, $options) . $baseIndent . '</select>' . $options['format.eol'];
        return $html;
    }

<select id="virtuemart_currency_id" name="virtuemart_currency_id" class="inputbox" onchange="this.form.submit()">