This is an excellent book for anyone wanting a complete guide to writing their own DHTML.
If you need support version 4 browsers as well then the book refers you to the web site which still has the scripts available from the second edition of the book that supported these browsers.
Most of the scripts in the book work as expected although in some cases the code provided can be simplified somewhat and still achieve the same result. A number of scripts have Internet Explorer code that gets applied to any browser that calls itself IE. There are also one or two that have unexpected side effects such as the script provided to get rid of active link borders that also makes the page impossible to use from the keyboard.