Need help with an email submit for please

This for was working but for some reason it has stopped.

This is the code on my website:

<form method="POST" action="mail.php">
   Your Name: <br />
   <input type="text" name="name" size="45"><br>
   <br>
   Your Email: <br />
    <input type="text" name="email" size="45"><br>
   <br>
   Your Message: <br />   
   <textarea rows="5" name="message" cols="36"></textarea>
   <img src="http://www.hybrid-computers.biz/phone.gif" alt="Phone" width="158" height="100" hspace="17" align="top" /><img src="http://www.hybrid-computers.biz/email.gif" alt="Email" width="100" height="90" align="top" /><br>
   <input type="submit" value="Submit" name="submit">
</form>

Code (markup):

And this is the code in mail.php:

<?php
if(isset($_POST['submit'])) {

$to = "mail@computer-juice.com";
$subject = "Enquiry - Hybrid Computers";
$name_field = $_POST['name'];
$email_field = $_POST['email'];
$message = $_POST['message'];
 
$body = "Name: $name_field
Email: $email_field
Message: $message";
 
echo "Thank you for contacting us.";
mail($to, $subject, $body);

} else {

echo "blarg!";

}
?>

Code (markup):

Any help appriciated.

 

What does happen then?

What errors do you get?

 

If it seems to be working but you're not getting the email, you can check your mail server logs to see if it's being sent/received.