Bemani hack on website

[James Kramer]

I have a Joomla site that was hacked by Bemani.   Has anyone heard of
this or is this some great genius that can hack a nearly wide open
site. It is running at the following address.
http://greaterpittsburgh.us/

I site was pretty wide open.  I was thinking about playing around with
an all open source website based on Joomla that anyone can modify.
The site is running on a virtual server.