Help book structure

A finished help book is a folder (directory) on the drive with files and folder inside. As a rule, the folder is named 'help' and resides just in the directory where the application has been installed.

The contents of the help book folder is as follows:

help/
  chapter1/        ; chapter 1 in the subfolder of its own
    index.html     ; start page fo the chapter 1
    ...            ; topic pages of the chapter 1
  yhgfx/           ; auxiliary folder with graphi
    book.png
    ...
  cont.css         ; style sheet for the right frame
  help.html        ; frameset definition
  help.js          ; master scripts
  idx_A.html       ; file of indexed phrases started with letter A
  ...
  idx_Z.html       ; file of indexed phrases started with letter Z
  index.html       ; content at a first glance (list of chapters)
  navi.css         ; style sheet for the left frame
  popupref.js      ; sñripts for the topics that invoke pop-up notes
  popup.js         ; scripts for pop-up notes themselves
  toc.html         ; table of contents
  yhusing.html     ; file of the topic on using the help book
  ...              ; files of top-level topics