someone help me

The url of my site is not working, and I do not know why!!
url: http://maistvonline.altervista.org
it only works if I type: http://maistvonline.altervista.org/joomla/
please help me ...
it worked when I created the saite but do not know what happened to him now not giving.

[Gianluca]

Pelase refer to: http://forum.en.altervista.org/web-p...p-problem.html , don't duplicate threads.