If you find javascript confusing this is the book for you. It doesn't tap the full potential of javascript but that is not its purpose. This book is specifically designed to take a beginner and teach them the basics. This, in my opinion, it achieves very well.
Buy a more comprehensive work (such as the javascript bible) after you have worked your way through this book and you'll have all you need to get going with javascript.
If ever your forget something basic, you'll find the answer in this book.
To sum up, this book alone helped me to pass a javascript certification exam.