gistfile1.js

var page = document.location.pathname.match(/[^\/]+$/)[0];

$(document).ready(function(){
    var ul = $('nav > ul'),
        li = ul.children('li'),
        href = li.find('a[href*="'+page+'"]');
    
    ul.prepend(href.parent());
    
    //move element to top
    if (page !== '') {
      li.children('a').each(function(){
        if (page != this.attr('href')) {
          ul.prepend("<li><a href='404NotFound.php'>404</a></li>");
        }
      })
    }
});