OK try a differnt approach - the antispam field has been amalgamated with the if statement - see below. Not sure if this will work but give it a go and see what happens. What it is saying now is ' if address2 is empty proceed'. If address2 is not empty it should not process the code between the braces.
if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "vote_artist") && (empty($_POST['address2'])) {
$insertSQL = sprintf("INSERT INTO vote_artist (`name`, `email`, artist, REMOTE_ADDR) VALUES (%s, %s, %s, %s)",
GetSQLValueString($_POST['name'], "text"),
GetSQLValueString($_POST['email'], "text"),
GetSQLValueString($_POST['artist'], "text"),
GetSQLValueString($_SERVER['REMOTE_ADDR'], "text"));
mysql_select_db($database_ukcr, $ukcr);
$Result1 = mysql_query($insertSQL, $ukcr) or die(mysql_error());
$insertGoTo = "vote_thanks_artist.php";
if (isset($_SERVER['QUERY_STRING'])) {
$insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
$insertGoTo .= $_SERVER['QUERY_STRING'];
}
header(sprintf("Location: %s", $insertGoTo));
}
?>