<header> 
        <nav>
          <a href="home.php">Home</a>
          <?php if($_SESSION[SESSION_NAME]['role'] == "admin"): ?>
          <a href="system.php">admin - menu</a>
          <?php endif; ?>
          <a href="chg_pass.php">Ganti Password</a>
          <a href="logout.php">Logout</a>
        </nav>
    </header>