I wrote this book for people who have some experience with javascript and no experience with Prototype. I mean for “experience with javascript” to cast a wide net: you may love javascript, or hate it, or love the language but hate browser scripting, or love both, or hate both. Because the book assumes some javascript experience, it does not cover the most basic parts of the javascript language itself, nor does it cover the DOM. There are many books that can get you started on that path, but the best free resource is Quirks Mode (www.quirksmode.org), the authoritative and exhaustive reference created by Peter-Paul Koch. This book is also meant to appeal to those who have some experience with Prototype but don’t consider themselves experts. Many have worked with Prototype indirectly through Ruby on Rails or a similar framework. Many have used a third-party script that depended on Prototype, but treated the code as a black box. In the first chapter of the book, we’ll look at some aspects of the javascript language that novice users may not know about. Feel free to spend as much time on Chapter 1 as you need, since it’s crucial that you understand these concepts if you want to use Prototype effectively. The screenshots in this book show Firefox running on Windows XP, but the code examples are designed to work in all major browsers and on all major platforms. Prototype boasts official support for Firefox (versions 1.5 and above), Internet Explorer (6 and above), Safari (2 and above), and Opera (9.2 and above). I welcome your feedback, observations, and ridicule.

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