I think there is some huge problems with your Joomla itself. Currently frontpage gives me:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at
[email protected] to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Please contact your hosting company support for more info (from error.log) on cause of that problem.