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if (!isset($_SESSION['id']) || !in_array($_SESSION['id'], array('1'))) {

<?php
session_start();
// check to see if the user is logged in
if ($_SESSION['loggedin']){
// user is logged in
  ?><div id="container"><?php
    echo 'Welcome ' . $_SESSION['name'] . '!' . '|' . '<a href="logout.php">logout?</a></div>';

?>
<head>
<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
<img src="images/logo.gif" class="bg">
<?php if (!isset($_SESSION['admin']) || !in_array($_SESSION['admin'], array('1'))) {
?>
<div id="container">
<div id="box">
  <h2>: Add User :</h2>
<p>
  <form action="action_adduser.php" method="post">
Username:  <input type="username" id="newuser" name="username"> <br />
Password:  <input type="password" id="newpassword" name="password"><br />
Email:  <input type="email" id="email" name="email"><br />
  <input type="submit" value="Add!">
  </form>
</p>
</div>
</div>


<?php
}
}elseif ($_SESSION['loggedin']) {
  # User is Logged in without any special permissions.
}else{
    // user is not logged in, send the user to the login page
    header('Location: login.php');
}
?>