Interactive Forms with Javascript / HTML Tutorial
http://www.zimmertech.com/tutorials/web-design/22/interactive-hidden-forms-tutorial.php

Zimmer, Brian
Zimmertech.com
2001

Abstract:

One of the most important aspects of web design is getting information from the viewer to the webmaster. This is where HTML forms are used. If you have been on the internet, you have seen forms before. Google uses them for search queries, Amazon uses them for shipping and credit card information, your bank uses them for you to login. Almost every site on the web has a type of form somewhere. We can't live without forms. How about changing the forms based on input by the viewer? This is where interactive forms using Javascript and HTML can help.