var timer;
var callback;

function handleRequest(request, response)
{
  if (request.queryString.indexOf("trigger") != -1) {
    setState("triggered", "triggered");
    response.setHeader("Cache-Control", "no-cache", false);
    response.setHeader("Content-Type", "text/javascript; charset=utf-8", false);
    response.write(";");
  } else {
    // Reset the state when running more than once in same browser session.
    setState("triggered", "");

    response.processAsync();
    response.setHeader("Cache-Control", "no-cache", false);
    response.setHeader("Content-Type", "text/html; charset=utf-8", false);
    response.write("<table><tr><td>A</td>     ");
    response.bodyOutputStream.flush();
    timer = Components.classes["@mozilla.org/timer;1"]
      .createInstance(Components.interfaces.nsITimer);

    callback = function() {
      if (getState("triggered") == "triggered") {
        response.write("<td>B</td></tr></table>");
        response.finish();
      } else {
        timer.initWithCallback(callback,
                               10,
                               Components.interfaces.nsITimer.TYPE_ONE_SHOT);
      }
    }
    timer.initWithCallback(callback,
                           10,
                           Components.interfaces.nsITimer.TYPE_ONE_SHOT);
    }
}