Prototype can be downloaded from its web site, http://prototypejs.org.
// <p>Example Paragraph</p>
// => 'result'
// <p >One</p> $('one').innerHTML; // => 'One'
Here, the first line indicates a snippet of HTML that will be used in the example, the second line demonstrates a Prototype method, and the third line indicates the value that the method returns.
And now, on with the show.