if($sent) in contact php form

At the bottom of a contact.php page I'm using for a form, I have

if($sent)
{print "Your mail was sent successfully"; }
else
{print "We encountered an error sending your mail"; }
?>


So when someone hits send it just takes them to a white page that says Your mail was sent successfully

How do I edit the code to send someone to a specific url after they hit send instead of this default print your mail was sent page.

Thanks.

 

if($sent)
{ @header("location:http://yahoo.com"); exit(); }
else
{print "We encountered an error sending your mail"; }
?>

 

Thanks man...