Update params from a view

Hi!

I have a view, where i have a form. In the form, of course there is
Submit button, but i have an another button, whit what peoples can
download a plugin. I generate this plugin, from the form. But if they
change the form, and click the generate button, before the submit, then
they will get a not expected/wrong plugin. The generate button is now a
link, to a method of the controller. I want to write a JS/Prototype
script, which refresh in the params the value of the form. Is it
possible? Or any suggestion, how to solve it? Thanks a lot!

Koli