app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Alerts.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_Adminhtml
 * @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)
 */


/**
 * Product alerts tab
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Alerts extends Mage_Adminhtml_Block_Template
{
    public function __construct()
    {
        parent::__construct();
        $this->setTemplate('catalog/product/tab/alert.phtml');
    }

    protected function _prepareLayout()
    {
        $accordion = $this->getLayout()->createBlock('adminhtml/widget_accordion')
            ->setId('productAlerts');
        /* @var $accordion Mage_Adminhtml_Block_Widget_Accordion */

        $alertPriceAllow = Mage::getStoreConfig('catalog/productalert/allow_price');
        $alertStockAllow = Mage::getStoreConfig('catalog/productalert/allow_stock');

        if ($alertPriceAllow) {
            $accordion->addItem('price', array(
                'title'     => Mage::helper('adminhtml')->__('Price alert subscription was saved successfully'),
                'content'   => $this->getLayout()->createBlock('adminhtml/catalog_product_edit_tab_alerts_price')->toHtml() . '<br />',
                'open'      => true
            ));
        }
        if ($alertStockAllow) {
            $accordion->addItem('stock', array(
                'title'     => Mage::helper('adminhtml')->__('Stock notification was saved successfully'),
                'content'   => $this->getLayout()->createBlock('adminhtml/catalog_product_edit_tab_alerts_stock'),
                'open'      => true
            ));
        }

        $this->setChild('accordion', $accordion);

        return parent::_prepareLayout();
    }

    public function getAccordionHtml()
    {
        return $this->getChildHtml('accordion');
    }
}

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