Yra php dalis, kur is POST ateina du masyvai su checkbox reiksmemis
Beda tame, jei viena is tu dvieju post masyvu buna tuscias, foreach 
keikias. Koki tikrinima butu galima bandyt?  if..else ?
Jeigu abu masyvai pilni, viskas normlaiai

$banip = $_POST['ban'] ;
$rmip = $_POST['rm'] ;
foreach ($banip as &$value) {
//exec (" iptables -A ids -s $value -j DROP ");
mysql_query("INSERT INTO bannedips SELECT * FROM newips WHERE ip = 
'$value'");
mysql_query("DELETE FROM newips WHERE ip='$value'");
}
foreach ($rmip as &$valu) {
//exec (" iptables -A ids -s $value -j DROP ");
mysql_query("DELETE FROM newips WHERE ip='$valu'");
}