html in kindle

I copied drools documentation on my kindle in this way:

open documentation as single html page and save using firefox (opera doesn't save images)

open the file with a text editor and remove the following

xmlns="" xmlns:d="http://docbook.org/ns/docbook" xmlns:rf="java:org.jboss.highlight.XhtmlRendererFactory"

import the saved page in the calibre's ebook library, fix metadata and convert to mobi

move the ebook in the kindle