HELP! Php Contact Form Question

I’ve done hours of research on this question and still can’t find an answer! I just created a php contact form using a Kirupa tutorial. I used it on a test website and it works great.

After visitors click submit I receive an e-mail with all the contact info. Problem is in the “From” part of of the e-mail it has my server address (or what looks like a server address) instead of the person’s email address who filled out the form. I’m not talking about Headers in the email body, but the “from” that appears across from the subject line when you’re scrolling through all your emails. I would like to change this because I’ll be using the form for my client’s websites as well.

Here is the code from my “mailer.php” file. Please let me know what to change or add. I’d really appreciate any help.

<?php
if(isset($_POST[‘submit’])) {

$to = "me@aol.com";
$subject = “Viewer Contact Information”;
$name_field = $_POST[‘name’];
$email_field = $_POST[‘email’];
$message = $_POST[‘message’];
$option = $_POST[‘radio’];
$dropdown = $_POST[‘drop_down’];

foreach($_POST[‘check’] as $value) {
$check_msg .= "Checked: $value
";
}

$body = "From: $name_field
E-Mail: $email_field
$check_msg Option: $option
Drop-Down: $dropdown
Message:
$message

E-Mail: $email_field
";

echo “Your information was Sent!”;
mail($to, $subject, $body);

} else {
echo “An Error Occur! Please Try to Submit Again”;
}
?>