PHP/html email form no longer submitting to mysql database
<form method="post" action="process-form.php" id="emailForm" name="emailForm"      target="_self">
    <h4>Sign up to be notified when we go live!</h4>
<label for="email">E-mail</label>
    <input type="text" name="email" id="email" />
<input type="submit" name="submit" id="submit" value="Submit"  onclick="return alert('Thanks! Your email has been added.');">

    <p>emails will not be shared with third parties</p>
</form>

<?php

//open database connect
$username = "username";
$password = "password";
$hostname = "server";

$conn = mysql_connect($hostname, $username, $password);
if (!$conn) die('Could not connect: ' . mysql_error());

//emaillist is the name of the database
mysql_select_db('emaillist');

//Clean data
function clean_data($string){
  if (get_magic_quotes_gpc()){
    $string = stripslashes($string);
  }
  $string = strip_tags($string);
  return mysql_real_escape_string($string);
}

//Mail Header removal
function remove_headers($string){
  $headers = array(
        "/to:/i",
        "/from:/i",
        "/bcc:/i",
        "/cc:/i",
        "/Content-Transfer-Encoding:/i",
        "/Content-Type:/i",
        "/Mime-Version:/i",
    );

    $string = preg_replace($headers, '', $string);
    return strip_tags($string);
}

//Pick up cleaned data
$email = clean_data($_POST['email']);


//Insert data
//emails is the name of the table
$query ="INSERT INTO emails (email)
  VALUES ('$email')";

mysql_query($query);

//close Connection
mysql_close($conn);

//redirect to page
header('Location: defaultUpCyc.html');
?>

if (!$conn) { die('Could not connect: ' . mysql_error()); }