app/code/core/Mage/Customer/Block/Account/Navigation.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_Customer
 * @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)
 */

/**
 * Customer account navigation sidebar
 *
 * @category   Mage
 * @package    Mage_Customer
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Customer_Block_Account_Navigation extends Mage_Core_Block_Template
{

    protected $_links = array();

    protected $_activeLink = false;

    public function addLink($name, $path, $label, $urlParams=array())
    {
        $this->_links[$name] = new Varien_Object(array(
            'name' => $name,
            'path' => $path,
            'label' => $label,
            'url' => $this->getUrl($path, $urlParams),
        ));
        return $this;
    }

    public function setActive($path)
    {
        $this->_activeLink = $this->_completePath($path);
        return $this;
    }

    public function getLinks()
    {
        return $this->_links;
    }

    public function isActive($link)
    {
        if (empty($this->_activeLink)) {
            $this->_activeLink = $this->getAction()->getFullActionName('/');
        }
        if ($this->_completePath($link->getPath()) == $this->_activeLink) {
            return true;
        }
        return false;
    }

    protected function _completePath($path)
    {
        $path = rtrim($path, '/');
        switch (sizeof(explode('/', $path))) {
            case 1:
                $path .= '/index';
                // no break

            case 2:
                $path .= '/index';
        }
        return $path;
    }

}

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