The book source is available at
https://launchpad.net/fenics-book, which contains a lot of math formulas and pdf images.
I took a lot of effort manually converting all the pdf and png images to eps images, so that latex2html won't complain. However, after this much effort, latex2html still failed to convert any of the math formulas or figures to images. The log files (book.aux and images.log) are attached.