JavaScript Sourcebook wraps up with practical JavaScript information, including a handy "Fixing Broken JavaScript Programs" chapter that lists the 11 most common JavaScript programming errors and the methods for correcting them. There is also good documentation of JavaScript's capacity for working with HTML frames and outstanding information about advanced client-side topics, such as pull-based updates and image maps.
Computer-book authors frequently load their companion CD-ROMs with the source code from the chapters and leave it at that. McComb has arranged for permission to include Bill Dortch's useful hIdaho frameset functions on the CD-ROM that accompanies JavaScript Sourcebook. Though the functions are available on the Web, having them at hand is a plus for programmers.