FUNCTION getUniquePosts($num = 10, $db) {
$postarr = array();
$skip = array();
FOR($i = 0; $i < $num; $i++) {
    $sql = "SELECT p.ID as ID, p.Date as Date, p.Thread as Thread, t.Subject as Subject from unb_posts AS p, unb_threads AS t where (p.Thread=t.ID)";
    IF(COUNT($skip)) {
        foreach($skip AS $tid) {
            $sql .= "AND (p.Thread != ".$tid.") ";
        }
    }
    $sql .=" ORDER BY p.Date DESC limit 1";
    // okay, do query
    $res = mysql_query($sql, $db);
    $row = mysql_fetch_assoc($res);
    $postarr[] = $row;
    $skip[] = $row['Thread'];
}
RETURN $postarr;
}