Please give me an idea on how to display elements in a page depending on who is logged in. For example, a user or an administrator. I'm thinking of something like this but I get a parse error, what do I lack in this code?:

 <?php

session_start();

if (!(isset($_SESSION['loginAdmin']) && $_SESSION['loginAdmin'] != '')) {
header ("Location: loginam.php");
}

if else (!(isset($_SESSION[['loginAdmin']) && $_SESSION['loginAdmin'] =='')) { ?>
                                                <?php include('head2.php');  ?>
                                                   }

<?php
if (!(isset($_SESSION['login']) && $_SESSION['login'] != '')) {
header ("Location: login.php");
}

if else (!(isset($_SESSION[['login']) && $_SESSION['login'] =='')) { ?>
                                            <?php   include('head3.php');
                                                   }

?>    

Please help