Hi sicknote,
Looks like the webpage has been cleared
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=windows-1252" http-equiv=Content-Type></HEAD>
<BODY></BODY></HTML>
Are you the only one with local administrative access to the webpage, I believe I would replace the page from my backup and then change my passwords (or vice versa).
Keep an eye on the page for a while (might want to check your local environment for malicousness/viruses/extended threats) to see if it changes all by itself again. This is a good start.