Highscore problem. Crossdomain.xml

Hi!

I'm making a Pinball game for an assignment at school, but I'm having a problem with my highscore feature.

SecurityException: No valid crossdomain policy available to allow access

When I made the highscore database and PHP files, it worked perfectly when running in the editor without a crossdomain.xml. When I got home, uploaded my game to 'www.home.no/myusername' and added a crossdomain.xml, it didnt work. I know the crossdomain.xml needs to be in the root, but in this case i have no control over the root domain, www.home.no. Its a website where you can register with a username and upload you're website (or other things).

My question is, will 'home.no/myusername' act as a root domain or is my .xml file written wrong?

 <?xml version="1.0"?>
 <cross-domain-policy>
 <allow-access-from domain="*" />
 </cross-domain-policy>