QtWebKit: Can’t load full html code from page

If we look at a plain source code of a website we will see that all ads, or most of them (flash, Google, others) are inserted as a JavaScript code. But if you look at the code in for example Firefox Firebug you will see that the JavaScript have been replaced with the HTML code of the add.
I want to load and parse this “full” html and I believed that Qt WebKit can do such stuff.

I tried to do it in that way:

Code:

---

PageLoader::PageLoader(const QUrl &url)
{
    mWebPage = new QWebPage();
    mWebPage->settings()->setAttribute(QWebSettings::JavascriptEnabled, true);
    mWebPage->settings()->setAttribute(QWebSettings::PluginsEnabled, false);
    mWebPage->settings()->setAttribute(QWebSettings::AutoLoadImages, false);
    mWebPage->settings()->setAttribute(QWebSettings::JavascriptCanOpenWindows, false);
    connect(mWebPage->mainFrame(),SIGNAL(loadFinished(bool)), this, SLOT(processPage()));
    mWebPage->currentFrame()->load(url);
}
 
void PageLoader::processPage()
{
    QWebFrame* frame = mWebPage->currentFrame();
    QString webHtml = frame->toHtml();
    QFile file("/home/ostap/output.txt");
    file.open(QIODevice::WriteOnly | QIODevice::Text);
    QTextStream out(&file);
    out << webHtml;
    emit finished();
}

---

But in output file I have only plain html with links to *.js files in script tags.

Where is my problem?