Send a Div to Mail

I'm making a system and i want to add a button that if you click it.. will send some info from a div to a friend, but to be honest i dont have any idea how can i do this..

i used google to find info and i think is something like that can works

<?php
if (isset($_POST['email'])) {
$to = "friendemail";
$subject = "Website Info";
$email = 'email';
$message = ???div content???;
$headers = "From: $email";
$sent = mail($to, $subject, $message, $headers);
if ($sent) {
echo "<script>alert('Email has been sent')</script>";
} else {
echo "<script>alert('Sorry Cannot send this email')</script>";
}
}
?>

the div sometimes contains images so i think this can help 

$str=htmlspecialchars("<div>testing the div</div>", ENT_QUOTES);
$message = $str;
$message =htmlspecialchars_decode($orignal_msg_body);

Please help. x.x