Yup! I know it!
Your first exercise is to mimic the behavior you just saw. Throw up three dialog boxes and end with a page that reads, "Yup! I know it!" If you've tried, but can't quite get it, View Source on this page to see an example of a solution. There are many possible solutions, some more elegant than others, and some that are pretty much as good as one another. If your solution works, is understandable, and doesn't take too long to run, you have a good solution.
Once you've looked at my personal solution, go on to the review of this lesson.