Спасибо огромное =) *Сидит - вникает*

А строка:

list($userCount) = $db->sql_fetchrow($db->sql_query("SELECT COUNT(user_id) AS userCount from ".$user_prefix."_users WHERE user_regdate LIKE '$curDate2'"));
list($userCount2) = $db->sql_fetchrow($db->sql_query("SELECT COUNT(user_id) AS userCount FROM ".$user_prefix."_users WHERE user_regdate LIKE '$curDateP'"));
echo "<center>$who_online<br>"
.""._BTD.": <b>$userCount</b> - "._BYD.": <b>$userCount2</b></center>";