function mysql_autoid($id,$table){
    $query = 'SELECT MAX('.$id.') AS last_id FROM '.$table;
    $result = mysql_query($query);
    $result = mysql_fetch_array($result);
    return $result[last_id]+1;
}

// usage mysql_autoid('nID','news');
// for use with fields that don't have auto_increment enabled
// otherwise just use $last_id = mysql_insert_id(); following a successful INSERT

Auto Increment Function

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