Ctrl+F5? They're right there. If you aren't even getting a red X then I really wonder what's wrong with your browser/ISP/PC/etc.

Wait... wait. Turn off whatever dumb adblocking software you have. They're in a folder with /banners/ in the url and some stupid ad blockers stop this. If you have ZoneAlarm, go to Privacy and turn Ad Blocking (and if you're smart, Cookie Control too) off, at least when viewing this thread.