serialize()

Hi list, I've already look at the php manual but couldn't figure out a way to use serialize to solve my problem. I have a form, with many fields like (name, age, adress, state), that I put a save button. This button allows my user to save the fields already filled in order to finish the form later. I thought in get the values submited by the save button and store it as cookie, them read it back later, but how can I store the fields in cookie with serialize and use it later to complety my fields again??? Thanks Rodrigo --