echo '<br />';
$continue = new moodle_url('/mod/book/delete.php', array('id'=>$cm->id, 'chapterid'=>$chapter->id, 'confirm'=>1));
$cancel = new moodle_url('/mod/book/view.php', array('id'=>$cm->id, 'chapterid'=>$chapter->id));
-echo $OUTPUT->confirm("<strong>$chapter->title</strong><p>$strconfirm</p>", $continue, $cancel);
+$title = format_string($chapter->title);
+echo $OUTPUT->confirm("<strong>$title</strong><p>$strconfirm</p>", $continue, $cancel);
echo $OUTPUT->footer();
\ No newline at end of file