There are two divs below this paragraph called doc1 and doc2. The two buttons fill them. The demo is that you can indeed pass information as a closure. See the html source to see how it's done. The first button links to a page that sleeps for a second before returning it's text. The second button links to a page that returns immediately. Try hitting each of them at various times to see what happens. Reload the page to clear them.
This text is in the main page
( Note the page is not reloading upon clicking )