thanks and feedback needed on JavaScript program

Thanks to codingforums that help me to gain success with my javascript program!
Please let me know what do you think about it:
http://backslash.altervista.org/messa/mass_search.html

The js script read the page
http://backslash.altervista.org/messa/orari_messa.html
and get the church's data and the mass's time. I know it'll better use a db but i have no control on server where the html page is (the mine is only a copy) and i want to do something that if the owner of the server want put in, it can without problem.
Any review will be very appreciated

Thanks

ps: look at the footer ;)
pps: sorry it's all in italian

Should not stagione be Stagione?
And "reset fields" be whatever that is in Italian?

When I click on Cerca without selecting an Inizio, Fine etc. I get an error. You need to ensure that all four select box options have been selected before further processing takes place. In other words

if (any of the four select boxes selectedIndex == 0 ) {
alert ("Please make a selection from all four option lists");
return false;
}

You select boxes would perhaps look nicer if they were centered.

But thank you for the gracious acknowledgement given to this forum! :)

thanks to have seen the page!!