Redirect malicious page loads

[marto]

Is there a way to add this into the forum index.php??

<?
$gawd = array ("xxx.xxx.xxx.xxx", "xxx.xxx.xxx.xxx", "xxx.xxx.xxx.xxx");
foreach($gawd as $kill) {
if (ereg($kill, $_SERVER['REMOTE_ADDR'])) {
header('Location: http://www.ic3.gov');
exit();
} else {
LOAD FORUM INDEX HERE;
exit();
}
}

?>

I know I can ban them in the CP but this still uses resources to load the error page. Wouldn't something like this be less intensive.

maybe .htaccess would be a better way to go. I dunno what does anyone think?