saving data

Hi to all, Is it possible to save information from a form without being submitted? I know this question might be a little extrange for some of you. The reason why I'm asking this question is because I collect information from different places where users fill out a big form, they're complaining because sometimes they are about to finish filling out the form when they lose connection I was wondering if there is a way to get this data temporaly and then when they reconnet to the system display all the fields with the information they already type in. If someone has any idea, please let me know Thanks in advanced Nato