I have tried to make my form redirect to a success or fail page. I have searched all through the internet, looking at normal form redirects and even javascript onClick redirect's. Can someone help me add with adding a redirect:
HTML:
<!-- ///////////////////////////////////////////////////////////////////////////////// -->
   <!-- CONTACT FORM -->
   <div class="col-lg-6">
   <h1>CONTACT</h1>
         <h3 class="service_h3">Say Hello! Ask something?</h3>               
           <form action="submit_contact.php" id="contactForm">
            <fieldset>
            <div id="result"></div>
               <!-- ///////////////////////////////////////////////////////////////////////////////// -->
               <!-- NAME FIELD -->
                <div class="form-item">
                <label for="name">
                <input type="text" name="name" id="name" placeholder="Enter Your Name" required/>
                </label>
                </div>
               <!-- ///////////////////////////////////////////////////////////////////////////////// -->
               <!-- EMAIL FIELD -->
                <div class="form-item">
                <label for="email">
                <input type="email" name="email" id="email" placeholder="Enter Your Email" required/>
                </label>
                </div>
               <!-- ///////////////////////////////////////////////////////////////////////////////// -->
               <!-- MESSAGE FIELD -->
                <div class="form-item">
                <label for="message">
                <textarea name="message" id="message" placeholder="Your Message" required></textarea>
                </label>
                </div>
               <!-- ///////////////////////////////////////////////////////////////////////////////// -->
               <!-- SUBMIT BUTTON -->
                <div class="form-item">
                <button name="submit" class="submit_btn" action="submit_contact.php" window.open("Done") type="submit">Submit</button>
                </div>
            </fieldset>
           </form>
         </div>
PHP:
<?php
/* Subject and Email Variables*/
$emailSubject = 'Contact Form Submission';
$webMaster = 'no-reply@*Hidden*.com';
/* Gathering Data Variables */
$nameField = $_POST['name'];
$emailField = $_POST['email'];
$messageField = $_POST['message'];
$ip = $_SERVER['REMOTE_ADDR'];
$hostaddress = gethostbyaddr($ip);
$browser = $_SERVER['HTTP_USER_AGENT'];
$referred = $_SERVER['HTTP_REFERER'];
$body = <<<EOD
<br><img src="*Hidden*"> <br>GoAerox! Network - Contact Form Submission<hr><br>
<strong>Name:</strong> $nameField <br>
<strong>Email:</strong>  $emailField <br>
<strong>Message:</strong>  $messageField <br><br>
<hr><br><strong>User Details</strong><br>
<strong>IP Address:</strong>  $ip <br>
<strong>Host address:</strong>  $hostaddress <br>
<strong>Browser:</strong>  $browser <br>
<strong>Referred:</strong>  $referred <br>
EOD;
$headers = "From: $emailField\r\n";
$headers .= "Content-type: text/html\r\n";
$success = mail($webMaster, $emailSubject, $body, $headers);
/* Results rendered as HTML */
$theResults = <<<EOD
<html>
**RESULT PAGE**
</html>
EOD;
echo "$theResults";
?>                                
Please give an answer that is easily read by a amatuer PHP coder. Note: I am happy for this to redirect to a page or popup on the actual contact page. As long as the user can see that the form has been submitted without error.
 
     
    