Form for sending mail not sending - php

Question

I have a "tell a friend" pop up email form that allows users to share my page with an email address that they enter. It pops up fine, but I can't get the form to send the email.
html:
<div id="tellfriend">
Close
<form id='tellafriend_form' method="post" action="#sendMessage" name="tellafriend_form">
<label for="name">Your Name:</label>
<input type="text" id="name" name="name" />
<label for="to">Friend's email:</label>
<input type="text" id="to" name="to" />
<label for="subject">Subject:</label>
<input type="text" id="subject" name="subject" />
<label for="message">Message:</label>
<textarea id="message" name="message"></textarea>
<input type="submit" name="submit" value="Submit">
</form>
</div><!-- #tellfriend -->
javascript that handles the "pop up":
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js" type="text/javascript"></script>
<script>
$(function() {
$('#tellfriend').hide();
$('#sendMessage').click(function(e) {
$("#tellfriend").fadeToggle('fast');
});
});
</script>
php that's supposed to send the mail:
<?
if (isset($_POST['Submit'])) {
// This will check to see if the form has been submitted
$senders_name = $_POST['name'];
// The person who is submitting the form
$recipient_friend = $_POST['to'];
// The forms recipient
$subject = $_POST['subject'];
// The subject line
$message = $_POST['message'];
// The message being sent
mail($recipient_friend, "From $senders_name", $subject, $message);
if (isset($_POST['your_email'])) {
echo "<br>Your friend has been contacted <br><br>Thank you $senders_name";
}}
?>
Disclaimer: PHP newbie, hoping to learn. Thanks!

Answer 1

The order of your parameters in mail function is not correct. see this
it should be
mail($recipient_friend, $subject, $message);
if you want to use headers then do this
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= 'To: '.$recipient_friend.' <'.$recipient_friend.'>' . "\r\n";
$headers .= 'From: '.$sender.' <'.$senderEM.'>' . "\r\n";
Then call mail like this
mail($recipient_friend, $subject, $message, $headers);

Answer 2

You have one error in your PHP code:
if (isset($_POST['Submit'])) {
should be:
if (isset($_POST['submit'])) {
with a lowercase "s".
Indeed the name of you submit button is "submit" but the value is "Submit".
You could eventually do that:
if (isset($_POST['submit']) && $_POST['submit'] == 'Submit') {
And your mail parameters are not correct like boug said.

Answer 3

You have 2 errors
first:
if (isset($_POST['submit']))
// $_POST is case sensitive
second:
if (isset($_POST['your_email']))
// you dont have an inout named 'your_email'