var nav = {
 go: function(url, other_url, back) {
  var url = ((other_url) ? other_url : $(url).attr('href'));

  $.get(url, function(data) {
   var result = data;

   var title = result.match(/<title>(.*?)<\/title>/i);
   var content = result.match(/<div id="page">([\s\S]*)<\/div>/i);
   var scripts = result.match(/<script id="allscripts" type="text\/javascript">([\s\S]*)<\/script>/i);
   var scripts_result = scripts ? scripts[1] : '';

   if(content) {
    // изменяем title
    document.title = title[1].toString();
    // загружаем содержимое
    $('#page').html(content[1].toString());

    // исполняем скрипты
    if(scripts_result) {
     eval(scripts_result);
    }

    if(!back) {
     window.history.ready = true;
     history.pushState ? history.pushState({}, '', url) : location.hash = url;
    }

    if($('#nav_value').html()) {
     $('#nav_value').html(url);
    } else {
     $('body').append('<div style="display: none" id="nav_value">'+url+'</div>');
    }
   }
  });

  return false;
 }
}

function ajax_page_back() { // Назад для старых и новых браузеров
 if(history.pushState) {
  $(window).bind('popstate', function(e) {
   var window_location_url_h = $('#nav_value').html();
   if(window_location_url_h) {
    nav.go('', window.location.href, true);
   }
  });
 } else {
  var lhref_interval = setInterval(function() {
   var now_url = window.location.href.split('//');
   var real_now_url = now_url[1].replace('socify.ru', '').replace(/\/(.*?)\#/gi, '');
   var ajax_url = $('#nav_value').html();
   if(ajax_url) {
    if(real_now_url != ajax_url) {
     nav.go('', real_now_url, true);
     clearInterval(lhref_interval);
     setTimeout(function() {
      ajax_page_back();
     }, 100);
    }
   }
  }, 10);
 }
}

ajax_page_back();