app/code/core/Mage/Checkout/Block/Cart/Totals.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Checkout
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class Mage_Checkout_Block_Cart_Totals extends Mage_Checkout_Block_Cart_Abstract
{
    protected $_totalRenderers;
    protected $_defaultRenderer = 'checkout/total_default';

    protected $_totals = null;

    public function getTotals()
    {
        if (is_null($this->_totals)) {
            return parent::getTotals();
        }
        return $this->_totals;
    }

    public function setTotals($value)
    {
        $this->_totals = $value;
        return $this;
    }

    protected function _getTotalRenderer($code)
    {
        if (!isset($this->_totalRenderers[$code])) {
            $this->_totalRenderers[$code] = $this->_defaultRenderer;
            $config = Mage::getConfig()->getNode("global/sales/quote/totals/{$code}/renderer");
            if ($config)
                $this->_totalRenderers[$code] = (string) $config;

            $this->_totalRenderers[$code] = $this->getLayout()->createBlock($this->_totalRenderers[$code], "{$code}_total_renderer");
        }

        return $this->_totalRenderers[$code];
    }

    public function renderTotal($total, $area = null, $colspan = 1)
    {
        $code = $total->getCode();
        if ($total->getAs()) {
            $code = $total->getAs();
        }
        return $this->_getTotalRenderer($code)
            ->setTotal($total)
            ->setColspan($colspan)
            ->setRenderingArea(is_null($area) ? -1 : $area)
            ->toHtml();
    }

    public function renderTotals($area = null, $colspan = 1)
    {
        $html = '';

        foreach($this->getTotals() as $total) {
            if ($total->getArea() != $area && $area != -1) {
                continue;
            }

            $html .= $this->renderTotal($total, $area, $colspan);
        }

        return $html;
    }
}

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