Just for fun, (I started to hobby with Finnish Online help for XnView...

Here is the base of the process:
http://www.markus3d.com/xnview/xnviewonlinehelp.html
I am building it for XnView 1.92 and it uses CSS-styles (recommended) and all the menus are from Finnish language.
More details you can see from the file itself, I wrote there in English, what's done today. At least it is some sort of idea for a start.

EDIT (2008-02-09):
For some reason, Firefox's FireFTP plugin does not work (again), and when tried to update the online help, FireFTP overwrited the existing xnviewonlinehelp.html file with zero size file.

EDIT 2 (2008-02-09):
After tens of tries, I could get uploaded html-file, but not *.htc.