Вот это:

if ($new_topic == 0) {
$qdb = "WHERE (ihome='0' OR catid='0')";
$home_msg = "";
} else {
$qdb = "WHERE topic='$new_topic'";
$result_a = $db->sql_query("SELECT topictext FROM ".$prefix."_topics WHERE topicid='$new_topic'");
$row_a = $db->sql_fetchrow($result_a);
$numrows_a = $db->sql_numrows($result_a);
$topic_title = filter($row_a['topictext'], nohtml);

На это

if ($new_topic == 0) {
$qdb = "WHERE (ihome='0' OR s.catid='0') AND s.time <= NOW()";
$home_msg = "";
} else {
$qdb = "WHERE topic='$new_topic' AND s.time <= NOW()";
$result_a = $db->sql_query("SELECT topictext FROM ".$prefix."_topics WHERE topicid='$new_topic'");
$row_a = $db->sql_fetchrow($result_a);
$numrows_a = $db->sql_numrows($result_a);
$topic_title = stripslashes(check_html($row_a['topictext'], "nohtml"));