Mailinglist

I wan’t to make an mailinglist form within flash.
I already have a emailform that i can rebuild to a mailinglist folder but i want to use the radiobutton component with 2 options subscribe and unsubscribe. how can i let them work and integrade within my PHP form? And then how to send backl an automessage?

the PHP form looks like this for the normal wmail form

<?
if(!empty($HTTP_POST_VARS['sender_mail']) || !empty($HTTP_POST_VARS['sender_message']) || !empty($HTTP_POST_VARS['sender_subject']) || !empty($HTTP_POST_VARS['sender_name']))
{
	$to = "[email protected]";
	$subject = stripslashes($HTTP_POST_VARS['sender_subject']);
	$body = stripslashes($HTTP_POST_VARS['sender_message']);
	$body .= "

---------------------------
";
	$body .= "Mail sent by: " . $HTTP_POST_VARS['sender_name'] . " <" . $HTTP_POST_VARS['sender_mail']  . ">
";
	$header = "From: " . $HTTP_POST_VARS['sender_name'] . " <" . $HTTP_POST_VARS['sender_mail'] . ">
";
	$header .= "Reply-To: " . $HTTP_POST_VARS['sender_name'] . " <" . $HTTP_POST_VARS['sender_mail'] . ">
";
	$header .= "X-Mailer: PHP/" . phpversion() . "
";
	$header .= "X-Priority: 1";
	if(@mail($to, $subject, $body, $header))
	{
		echo "output=sent";
	} else {
		echo "output=error";
	}
} else {
	echo "output=error";
}
?>

Can someone helps me out?

Thanks kind regardds Jos