$reply_msg = new fud_msg_edit;
 $reply_msg->poster_id = $id;
 $reply_msg->subject = "a reply";
 $reply_msg->body = "body of msg";
 $reply_msg->add_reply(151, 118, "", "", TRUE); //118=thread_id, 151=msg id
 $result = uq("select max(id) from {SQL_TABLE_PREFIX}msg");
 $var = db_rowarr($result);      
  if(isset($var[0])){
      $reply_msg->approve($var[0], FALSE);	
  }