How to save form data?

[ernxos@gmail.com]

Hi,

There is a button on one of my www pages which changes page content. It
adds some fields to the form, which is created by php script. After
changing the page is displayed once again. What I want to do is to save
form data so after changing and reloading the page field are filled.
That button is not Submit button. Can I do such thing?