function zagolovok($id)
{
    $result_page = mysql_query("SELECT title FROM page WHERE id=".$id);
    $myrow_page = mysql_fetch_array($result_page);

    $sm_read = file("/templates/registration_ua.html");
    $sm_read = implode("",$sm_read);
    $sm_read = str_replace("[_title]",$myrow_page['title'],$sm_read);
    return $sm_read;
}

<?php
    include("/admin/page.php");
    $txt = blog(1);
include("templates/registration_ua.html");//Подключение шаблона
?>