I probably made something not popular, but I decided to add (minimal)
advertisement on all demo pages (using
config.footer.inc.php). You can dislike this step, but if
number of visits for demo server will grow this way, it will soon need
hardware upgrade and I'm not willing to pay it from my money.
If you want me to remove ads, the only way to do it is to donate some amount which might be used for hardware upgrade. In really near future server will probably need more memory.