going to ssba.phillyarena.net is the same site as ssba.phillyarena.net/index.php. They're both the index page.
if you're seeing a page with errors, it's because ssba.phillyarena.net/index.htm was deleted, but you still have it cached. Refresh the page, and you should see the new one. If you don't, delete your internet files and go back to
http://ssba.phillyarena.netbut
http://ssba.phillyarena.net is the correct location.