Including Page URL in the Form#

I want to trac the URL from which the below form was submitted. I am new to php & tried this code :

PHP Code :


<?php

// Receiving variables
@$full_name = addslashes($_POST['full_name']);
@$email = addslashes($_POST['email']);
@$phone = addslashes($_POST['phone']);
@$pageurl = addslashes($_POST['pageurl']);


// Validation
if (! ereg('[A-Za-z0-9_-]+\@[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+', $email))
{
header("Location: error.html");
exit;
}

//Sending Email to form owner
# Email to Owner
$pfw_header = "From: $email";
$pfw_subject = "Booking Request";
$pfw_email_to = "kolkatarsubha@gmail.com";
$pfw_message = "full_name: $full_name\n"
. "email: $email\n"
. "phone: $phone\n"
. "pageurl: $pageurl\n";
@mail($pfw_email_to, $pfw_subject ,$pfw_message ,$pfw_header ) ;

header("Location: thank-you.html");

?>

HTML Form :



Please Help Me .