Page not found (error 404)

The page http://francescoachenza.altervista.org/GUIDE/appunti/JAVASCRIPT/Trovare_tasti_premuti_(keypress) was not found on this server.

This can be due to:

Pay attetion to UPPER and LOWER cases
http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html