function hookAdminStatsModules()
    {
        if (Tools::isSubmit('submitTruncatePNF')) {
            Db::getInstance()->Execute('TRUNCATE `' . _DB_PREFIX_ . 'pagenotfound`');
            $this->_html .= '<div class="conf confirm"><img src="../img/admin/ok.gif" /> ' . $this->l('Pages not found has been emptied.') . '</div>';
        }
        $this->_html .= '<fieldset class="width3"><legend><img src="../modules/' . $this->name . '/logo.gif" /> ' . $this->displayName . '</legend>';
        if (!file_exists(dirname(__FILE__) . '/../../.htaccess')) {
            $this->_html .= '<div class="warning warn">' . $this->l('You <b>must</b> use a .htaccess file to redirect 404 errors to the page "404.php"') . '</div>';
        }
        $pages = $this->getPages();
        if (sizeof($pages)) {
            $this->_html .= '
			<table class="table" cellpadding="0" cellspacing="0">
				<tr>
					<th width="200">' . $this->l('Page') . '</th>
					<th width="500">' . $this->l('Referrer') . '</th>
					<th>' . $this->l('Counter') . '</th>
				</tr>';
            foreach ($pages as $ru => $hrs) {
                foreach ($hrs as $hr => $counter) {
                    if ($hr != 'nb') {
                        $this->_html .= '
						<tr>
							<td><a href="' . $ru . '-admin404">' . wordwrap($ru, 30, '<br />', true) . '</a></td>
							<td><a href="' . Tools::getProtocol() . $hr . '">' . wordwrap($hr, 40, '<br />', true) . '</a></td>
							<td align="right">' . $counter . '</td>
						</tr>';
                    }
                }
            }
            $this->_html .= '
			</table>';
        } else {
            $this->_html .= '<div class="conf confirm"><img src="../img/admin/ok.gif" /> ' . $this->l('No pages registered') . '</div>';
        }
        $this->_html .= '</fieldset>';
        if (sizeof($pages)) {
            $this->_html .= '<div class="clear">&nbsp;</div>
			<fieldset class="width3"><legend><img src="../img/admin/delete.gif" /> ' . $this->l('Empty database') . '</legend>
				<form action="' . Tools::htmlEntitiesUtf8($_SERVER['REQUEST_URI']) . '" method="post"><input type="submit" class="button" name="submitTruncatePNF" value="' . $this->l('Empty ALL pages not found') . '"></form>
			</fieldset>';
        }
        $this->_html .= '<div class="clear">&nbsp;</div>
		<fieldset class="width3"><legend><img src="../img/admin/comment.gif" /> ' . $this->l('Guide') . '</legend>
			<h2>' . $this->l('404 errors') . '</h2>
			<p>' . $this->l('A 404 error is an HTTP error code which means that the file requested by the user cannot be found. In your case it means that one of your visitors entered a wrong URL in the address bar or that you or another website has a dead link. When it is available, the referrer is shown so you can find the page which contains the dead link. If not, it means generally that it is a direct access, so someone may have bookmarked a link which doesn\'t exist anymore.') . '</p>
			<h3>' . $this->l('How to catch these errors?') . '</h3>
			<p>' . $this->l('If your webhost supports the <i>.htaccess</i> file, you can create it in the root directory of PrestaShop and insert the following line inside:') . ' <i>ErrorDocument 404 ' . __PS_BASE_URI__ . '404.php</i>. ' . $this->l('A user requesting a page which doesn\'t exist will be redirected to the page.') . ' <i>' . __PS_BASE_URI__ . '404.php</i>. ' . $this->l('This module logs the accesses to this page: the page requested, the referrer and the number of times that it occurred.') . '</p><br />
		</fieldset>';
        return $this->_html;
    }
    public function hookAdminStatsModules()
    {
        if (Tools::isSubmit('submitTruncatePNF')) {
            Db::getInstance()->execute('TRUNCATE `' . _DB_PREFIX_ . 'pagenotfound`');
            $this->html .= '<div class="alert alert-warning"> ' . $this->l('The "pages not found" cache has been emptied.') . '</div>';
        } else {
            if (Tools::isSubmit('submitDeletePNF')) {
                Db::getInstance()->execute('DELETE FROM `' . _DB_PREFIX_ . 'pagenotfound`
				WHERE date_add BETWEEN ' . ModuleGraph::getDateBetween());
                $this->html .= '<div class="alert alert-warning"> ' . $this->l('The "pages not found" cache has been deleted.') . '</div>';
            }
        }
        $this->html .= '
			<div class="panel-heading">
				' . $this->displayName . '
			</div>
			<h4>' . $this->l('Guide') . '</h4>
			<div class="alert alert-warning">
				<h4>' . $this->l('404 errors') . '</h4>
				<p>' . $this->l('A 404 error is an HTTP error code which means that the file requested by the user cannot be found. In your case it means that one of your visitors entered a wrong URL in the address bar, or that you or another website has a dead link. When possible, the referrer is shown so you can find the page/site which contains the dead link. If not, it generally means that it is a direct access, so someone may have bookmarked a link which doesn\'t exist anymore.') . '
				</p>
				<p>&nbsp;</p>
				<h4>' . $this->l('How to catch these errors?') . '</h4>
				<p>' . sprintf($this->l('If your webhost supports .htaccess files, you can create one in the root directory of PrestaShop and insert the following line inside: "%s".'), 'ErrorDocument 404 ' . __PS_BASE_URI__ . '404.php') . '<br />' . sprintf($this->l('A user requesting a page which doesn\'t exist will be redirected to the following page: %s. This module logs access to this page.'), __PS_BASE_URI__ . '404.php') . '
				</p>
			</div>';
        if (!file_exists($this->_normalizeDirectory(_PS_ROOT_DIR_) . '.htaccess')) {
            $this->html .= '<div class="alert alert-warning">' . $this->l('You must use a .htaccess file to redirect 404 errors to the "404.php" page.') . '</div>';
        }
        $pages = $this->getPages();
        if (count($pages)) {
            $this->html .= '
			<table class="table">
				<thead>
					<tr>
						<th><span class="title_box active">' . $this->l('Page') . '</span></th>
						<th><span class="title_box active">' . $this->l('Referrer') . '</span></th>
						<th><span class="title_box active">' . $this->l('Counter') . '</span></th>
					</tr>
				</thead>
				<tbody>';
            foreach ($pages as $ru => $hrs) {
                foreach ($hrs as $hr => $counter) {
                    if ($hr != 'nb') {
                        $this->html .= '
						<tr>
							<td><a href="' . $ru . '-admin404">' . wordwrap($ru, 30, '<br />', true) . '</a></td>
							<td><a href="' . Tools::getProtocol() . $hr . '">' . wordwrap($hr, 40, '<br />', true) . '</a></td>
							<td>' . $counter . '</td>
						</tr>';
                    }
                }
            }
            $this->html .= '
				</tbody>
			</table>';
        } else {
            $this->html .= '<div class="alert alert-warning"> ' . $this->l('No "page not found" issue registered for now.') . '</div>';
        }
        if (count($pages)) {
            $this->html .= '
				<h4>' . $this->l('Empty database') . '</h4>
				<form action="' . Tools::htmlEntitiesUtf8($_SERVER['REQUEST_URI']) . '" method="post">
					<button type="submit" class="btn btn-default" name="submitDeletePNF">
						<i class="icon-remove"></i> ' . $this->l('Empty ALL "pages not found" notices for this period') . '
					</button>
					<button type="submit" class="btn btn-default" name="submitTruncatePNF">
						<i class="icon-remove"></i> ' . $this->l('Empty ALL "pages not found" notices') . '
					</button>
				</form>';
        }
        return $this->html;
    }