Java Script made its first appearance in Netscape 2.0 in 1995 with the name Live Script.
To see how validation works, run this page and deliberately make mistakes.
This is all I want to accomplish--I've seen many posts on this topic but they are usually beyond what I need.
Here is my form: The checkbox is a simple "I agree".
Not the prettiest solution, but functional in all browsers with Java Script enabled.