Php email form problem

I am having a problem with my email form.

when you click on my sumit on my email fborm I dont get any email reply this is the code Im using on the button
(release) {
this.loadVariables(“email.php”, “POST”);
_root.form.nextFrame();
}

this is the code Im using for the php file that sends the email

<?php
$sendTo = “stephen_mulvain@hotmail.co.uk”;
$subject = “Reply from STEPHENMULVAIN.COM”;
$headers = “From: " . $_POST[“firstName”] .” “. $_POST[“lastname”] . “<” . $_POST[“email”] .”>
";
$headers .= "Reply-To: " . $_POST[“email”] . "
";
$headers .= "Return-path: " . $_POST[“email”];
$message = $_POST[“message”];
mail($sendTo, $subject, $message, $headers);
?>

I have checked with my host to make sure that php is enabled I have honestly no idea what to do except cry. some one please help me.