Flash-based email Form using php HELP

All I want to do is add a ‘telephone’ text input on the form. But I can’t figure out how. It all works fine but when I try to add this to the php it doesn’t work. Surely I just add another line into the php code?? How can it be so difficult?
I’ve seen this addressed before but without a real solution. Anybody?

<?php
$sendTo = “email@address.com”;
$subject = “Feedback form”;
$headers = “From: " . $_POST[“name”] .”<" . $_POST[“email”] .">
";
$headers .= "Reply-To: " . $_POST[“email”] . "
";
$headers .= "Return-path: " . $_POST[“email”];
$message = $_POST[“message”];
mail($sendTo, $subject, $message, $headers);
?>