You need a functional SGML system which allows the desired transformations with DSSSL. You'll need at least Jade or its successor, OpenJade. You'll also need a TeX installation if you plan to use the TeX backend (for DVI, PostScript, and PDF output). For a suggestion how to set up a free SGML system on the Win32 platform, see SGML for Windows NT. Many Linux distributions allow to install such a system with just a few packages, and TeX and friends are included anyway. The most complete distribution with regard to SGML seems to be Debian, see the Debian SGML/XML Howto
Furthermore you'll need the DocBook DTD and Norman Walsh's Docbook stylesheets.
To fix the JavaScript/JScript code in the Jade/OpenJade-generated HTML pages with the provided shell script you'll need ash (or bash) and sed. Both are part of all (afaik) Linux distributions and will compile on most Unix systems. Win32 ports are available with the free CygWin tools. If you don't want to use (b)ash and sed on Win32, you'll have to get yourself some other batch search-and-replace tool.