<script type="text/javascript" src="http://code.jquery.com/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {
 $('#submitForm').submit(function(e) {
 alert($('#sample').attr('value'));
 return e.preventDefault();
 });
});
</script>
<form id="submitForm" method="post">
 <input type="text" name="sample" id="sample" value="Enter something" />
 <input type="submit" id="submitBtn" value="Submit" />
</form>

<script type="text/javascript" 
 src="http://code.jquery.com/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {
 $('#submitBtn').click(function(e) {
 alert($('#sample').attr('value'));
 return e.preventDefault();
 });
});
</script>
<form id="submitForm" method="post">
 <input type="text" name="sample" id="sample" value="Enter something" />
 <input type="submit" id="submitBtn" value="Submit" />
</form>

<script type="text/javascript" 
 src="http://code.jquery.com/jquery.js"></script>
<script type="text/javascript" src="register.js"></script>
<div id="container">
 <div id="message"></div>
 <form method="post" id="mainform">
 <label for="username">Username</label>
 <input type="text" name="username" id="username" value="" />
 <label for="password">Password</label>
 <input type="password" name="password" value="" />
 <input type="submit" name="action" id="login" value="Log in" />
 <h2>Extra options (registration only)</h2>
 <label for="firstname">First name</label>
 <input type="text" name="firstname" value="" />
 <label for="lastname">Last name</label>
 <input type="text" name="lastname" value="" />
 <label for="email">Email</label>
 <input type="text" name="email" value="" />
 <input type="submit" name="action" id="register" value="Register" />
 </form>
</div>

$(document).ready(function() {
 $("#register, #login").click(function(e) {
 var name = ($(event.target).attr('id') == 'register') ? 'Registration' : 'Login';
 return e.preventDefault();
 });
});

$(document).ready(function() {
 $("#register, #login").click(function(e) {
 var name = ($(event.target).attr('id') == 'register') ? 'Registration' : 'Login';
 $('#message').slideUp('fast');
 $.post('service.php', $('#mainform').serialize() 
  +'&action='+ $(event.target).attr('id'), function(data) {
  var code = $(data)[0].nodeName.toLowerCase();
  $('#message').removeClass('error');
  $('#message').removeClass('success');
  $('#message').addClass(code);
  if(code == 'success') {
  $('#message').html(name + ' was successful.');
  }
  else if(code == 'error') {
  $('#message').html('An error occurred, please try again.');
  }
  $('#message').slideDown('fast');
 });
 return e.preventDefault();
 });
});

$.ajax({
 type: 'POST',
 url: url,
 data: data,
 success: success
 dataType: dataType
});

CREATE TABLE `ibm_user_auth` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `username` tinytext NOT NULL,
 `password` varchar(32) NOT NULL,
 `firstname` tinytext NOT NULL,
 `lastname` tinytext NOT NULL,
 `email` tinytext NOT NULL,
 PRIMARY KEY (`id`)
);

// Database connection values
define('DB_HOST', 'localhost');
define('DB_USERNAME', 'YOUR_USERNAME');
define('DB_PASSWORD', 'YOUR_PASSWORD');
define('DB_NAME', 'YOUR_DB_NAME');
if(isset($_POST['username'], $_POST['password'])) {
 extract($_POST);
 $db = mysql_connect(DB_HOST, DB_USERNAME, DB_PASSWORD);
 mysql_select_db(DB_NAME, $db);
 if($action == 'register' 
  && isset($_POST['firstname'], $_POST['lastname'], $_POST['email'])) {
 // Verify that the username is unique
 $query = mysql_query("select count(id) 
  from ibm_user_auth where username='$username'");
 $result = mysql_fetch_row($query);
 if ( $result[0] > 0 ) {
  die("<error id='0' />");
 }
 // Validate email
 if( !preg_match("^[a-z0-9,!#\$%&'\*\+/=\?\^_`\{\|}~-]+(\.[a-z0-9,!#\$%&
  '\*\+/=\?\^_`\{\|}~-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,})$^", 
  $_POST['email']) ) {
  die("<error id='1' />");
 }
 mysql_query("insert into ibm_user_auth 
  (username, password, firstname, lastname, email) 
  VALUES ('$username', MD5('$password'), '$firstname', '$lastname', '$email')");
 die("<success />");
 }
 else if($action == 'login') {
 $query = mysql_query("select count(id) from ibm_user_auth where 
  username='$username' and password=md5('$password')");
 $result = mysql_fetch_row($query);
 if($result[0] == 1) {
  session_start();
  $_SESSION['username'] = $username;
  die("<success />");
 }
 else die("<error id='2' />");
 }
}
?>

// Database connection values
define('DB_HOST', 'localhost');
define('DB_USERNAME', 'YOUR_USERNAME');
define('DB_PASSWORD', 'YOUR_PASSWORD');
define('DB_NAME', 'YOUR_DB_NAME');
if(isset($_POST['username'], $_POST['password'])) {
 extract($_POST);
 $db = mysql_connect(DB_HOST, DB_USERNAME, DB_PASSWORD);
 mysql_select_db(DB_NAME, $db);
 if($action == 'register' 
  && isset($_POST['firstname'], $_POST['lastname'], $_POST['email'])) {
 // Verify that the username is unique
 $query = mysql_query("select count(id) 
  from ibm_user_auth where username='$username'");
 $result = mysql_fetch_row($query);
 if ( $result[0] > 0 ) {
  $out = "<error id='0'><suggestions>";
  $out .= "<suggestion>" . $firstname . $lastname . "</suggestion>";
  $out .= "<suggestion>" . $firstname . "_" . $lastname . "</suggestion>";
  $out .= "<suggestion>" . $lastname . $firstname . "</suggestion>";
  $out .= "<suggestion>" . $lastname . "_" . $firstname . "</suggestion>";
  $out .= "</suggestions></result>";
  die($out);
 }
 // Validate email
 if( !preg_match("^[a-z0-9,!#\$%&'\*\+/=\?\^_`\{\|}~-]+(\.[a-z0-9,!#\$%&
  '\*\+/=\?\^_`\{\|}~-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,})$^", 
  $_POST['email']) ) {
  die("<error id='1' />");
 }
 mysql_query("insert into ibm_user_auth 
  (username, password, firstname, lastname, email) 
  VALUES ('$username', MD5('$password'), '$firstname', '$lastname', '$email')");
 die("<success />");
 }
 else if($action == 'login') {
 $query = mysql_query("select count(id) from ibm_user_auth 
  where username='$username' 
  and password=md5('$password')");
 $result = mysql_fetch_row($query);
 if($result[0] == 1) {
  session_start();
  $_SESSION['username'] = $username;
  die("<success />");
 }
 else die("<error id='2' />");
 }
}
?>

$(document).ready(function() {
 $("#register, #login").click(function(e) {
 var name = ($(event.target).attr('id') == 'register') ? 'Registration' : 'Login';
 $('#message').slideUp('fast');
 $.post('service.php', 
  $('#mainform').serialize() +'&action='+ $(event.target).attr('id'), 
   function(data) {
 var code = $(data)[0].nodeName.toLowerCase();
 $('#message').removeClass('error');
 $('#message').removeClass('success');
 $('#message').addClass(code);
 if(code == 'success') {
  $('#message').html(name + ' was successful.');
 }
 else if(code == 'error') {
  var id = parseInt($(data).attr('id'));
  switch(id) {
  case 0:
   $('#message').html('This user name has already been taken. 
    Try some of these suggestions:');
   form = $(document.createElement('form'));
   $(data).find('suggestions > suggestion').each(function(idx, el) {
   radio = $(document.createElement('input'));
   radio.attr({type: 'radio', name: 'suggested', 
    id: 'suggested_'+idx, 
    value: el.innerHTML});
   lbl = $(document.createElement('label'));
   lbl.attr('for', 'suggested_'+idx);
   lbl.html(el.innerHTML);
   form.append(radio);
   form.append(lbl);
   form.append('');
   });
  $('#message').append(form);
  $('#message form input[type="radio"]').click(function() {
   $('#username').val($(this).attr('value'));
  });
  break;
  case 1:
  $('#message').html('The e-mail entered is invalid.');
  break;
  case 2:
  $('#message').html('The user name or password you entered was invalid.');
  break;
  default:
  $('#message').html('An error occurred, please try again.');
  }
 }
 $('#message').slideDown('fast');
 });
 return e.preventDefault();
 });
});