мобильная панель навигации

Пишем разметку: <div id="smartphone"> <div id="content"> <div class="page page_active" id="page1"> <h3>An awesome design !</h3> <p>This is the first page.</p> </div> <div class="page" id="page2"> <h3>Brillant ideas</h3> <p>This is the second page.</p>...