Warning: Cannot modify header information - headers already sent

[designavenger]

Thank you MattR for your reply.

I need it to execute these three lines of code:

PHP Code:

$query_id = $_GET['queryID']; //Gets the querie's ID
        $q = "DELETE FROM contactwebmaster_requests WHERE wmqueryID='$query_id' LIMIT 1";
        $query_delete = $database->query($q) or die("MySQL error: ".mysql_error());; 


before the user is redirected, how can i make it so the header is called before input and make it run this code?