For the hundreds of thousands of Web enthusiasts who made their first foray into programming with the simple tagging language of HTML, JavaScript is the next step. JavaScript is a programming language designed to be used in conjunction with HTML, making HTML more powerful and interactive. It is now fully supported in Netscape Navigator 3. With JavaScript, Web page creators without deep technical experience can embed commands into their HTML pages that call up pre-cooked Java animations, add clocks and other time-based features, allow web pages to ask questions and gather information from visitors to the page, and provide other simple controls. While other JavaScript books are intended for experienced programmers, this one is for the vast majority of HTML coders who are less technically sophisticated but still would like to get their feet wet.
For short this book really wasn't that great. Being an experienced web designer with some college education, I'd have to say this is way behind the times. The implication of the book is way behind the CSS and XHTML standards with extremely outdated techniques. I will say that it is a good quick reference but to add on the list of cons it lacks explaining how anything you're using really works. So you're usually just blindly plugging code into pages with this book. Which is dangerous because if you have to fix or adjust something and don't know what to adjust it could cost you hours of frustration as it did me.
Instead I suggest an O'reilly book on JavaScript (especially the cook book series) because they have more up to date techniques. If you don't understand JavaScript at all, you should probably pick up a copy of Head First JavaScript which teaches you the language from head to toe in a creative and unique manner. Subtract a star if you don't like outdated material and add one if you're a Quickstart book series fan.