This library is used to render and manipulate jpeg files. Jpeg is extremely popular and LaTeX2HTML uses jpeg files when converting several LaTeX environments (e.g. R script from the relax package). Therefore, it is strongly recommended you also install this library. It does have an installation program, so it's very easy to do. Download jpeg-6b-4.exe and save it to our `Netpbm' folder (inside the `latex2html' folder on the desktop). When you double click that exe file, it should know where to install because it looks for the NetPbm (GnuWin32) directory. As above, if it does not recognize that you have installed NetPbm (GnuWin32) at C:\texmf then you must tell the installation program to install there.