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<script type=”text/javascript“>
  var comet = {
    connection   : false,
    iframediv    : false,

    initialize: function() {
      if (navigator.appVersion.indexOf(“MSIE”) != -1) {

        // Для IE

        comet.connection = new ActiveXObject(”htmlfile”);
        comet.connection.open();
        comet.connection.write(”<html>”);
        comet.connection.write(”<script>document.domain = ‘”+document.domain+”‘”);
        comet.connection.write(“</html>”);
        comet.connection.close();
        comet.iframediv = comet.connection.createElement(“div”);
        comet.connection.appendChild(comet.iframediv);
        comet.connection.parentWindow.comet = comet;
        comet.iframediv.innerHTML = “<iframe id=’comet_iframe’ src=’./backend.php’></iframe>“;

      }  else {

        // Для других браузеров (Firefox…)
        comet.connection = document.createElement(‘iframe’);
        comet.connection.setAttribute(‘id’,     ‘comet_iframe’);
        with (comet.connection.style) {
          left       = top   = “-100px”;
          height     = width = “1px”;
          visibility = “hidden”;
          display    = ‘none’;
        }
        comet.iframediv = document.createElement(‘iframe’);
        comet.iframediv.setAttribute(’src’, ‘./backend.php’);
        comet.connection.appendChild(comet.iframediv);
        document.body.appendChild(comet.connection);

      }
    },

    // эта функция вызывается из backend.php
    printServerTime: function (time) {
      $(‘content’).innerHTML = time;
    },

    onUnload: function() {
      if (comet.connection) {
        comet.connection = false; // удаление iframe для предотвращения вероятных проблем при перезагрузки страницы в IE
      }
    }
  }
  Event.observe(window, “load”,   comet.initialize);
  Event.observe(window, “unload”, comet.onUnload);

  </script>