Disable/enable submit button

I have a form that have a whole bunch of checkboxes, but visitors aren’t necessarily going to need to check any of them, unless they want to request for something, as the page also serves as a download page.

I want the submit button to be disabled, unless any of the checkboxes are clicked.

I was able to get the submit button enabled once any checkbox is checked, but what if visitor decides to uncheck them and there aren’t any checked after all, how can I change back the submit button to being disabled?

Here’s a link to what I’m trying to do
http://www.amplis.com/mockup/tests/lit/litDownload.asp?b=all&doc=all

once a checkbox is clicked, submit and reset are enabled, but how can I get the buttons disabled, if visitor unchecks all the ones they checked?

is this possible?

EDIT: I realized I was making it much more complicated than I needed and changed my solution :slight_smile: