How do I make my php contact form redirect the user to a thank you page after sending the email.

if (isset($_REQUEST['email']))
//if "email" is filled out, send email
  //send email
  $email = $_REQUEST['email'] ;
  $subject = $_REQUEST['fname'] ;
  $message = $_REQUEST['message'];
  mail("", "$subject",
  $message, "From:" . $email);
  echo "<a href=''>Thank you for your email, we will get back to you in the next 24 hours, click to go to the Home page</a>"; 

the html

<form id="contact" action="email.php" method="post">
            <div class="form_settings">
              <p><span>Name</span><input class="contact" type="text" id="fname" name="fname"/></p>
              <p><span>Email Address</span><input class="contact" type="text" id="email" name="email"/></p>
              <p><span>Message</span><textarea class="contact textarea" rows="5" cols="50" id="message" name="message"></textarea></p>
              <p style="padding-top: 15px"><span>&nbsp;</span><input class="submit" type="submit" name="contact_submitted" value="send" /></p>
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