headers and footers of chunked html.
--- /dev/null
+<refentry>
+<refmeta>
+<refentrytitle>navig.graphics.extension</refentrytitle>
+<refmiscinfo role="type">string</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>navig.graphics.extension</refname>
+<refpurpose>Extension for navigational graphics</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment id="navig.graphics.extension"><xsl:param name="navig.graphics.extension" select="'.gif'"/></src:fragment>
+</refsynopsisdiv>
+
+<refsect1><title>Description</title>
+
+<para>Sets the filename extension to use on navigational graphics used
+in the headers and footers of chunked HTML.</para>
+
+</refsect1>
+</refentry>
--- /dev/null
+<refentry>
+<refmeta>
+<refentrytitle>navig.graphics.path</refentrytitle>
+<refmiscinfo role="type">string</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>navig.graphics.path</refname>
+<refpurpose>Path to navigational graphics</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment id="navig.graphics.path"><xsl:param name="navig.graphics.path">images/</xsl:param></src:fragment>
+</refsynopsisdiv>
+
+<refsect1><title>Description</title>
+
+<para>Sets the path, probably relative to the directory where the HTML
+files are created, to the navigational graphics used in the
+headers and footers of chunked HTML.
+</para>
+
+</refsect1>
+</refentry>
--- /dev/null
+<refentry>
+<refmeta>
+<refentrytitle>navig.graphics</refentrytitle>
+<refmiscinfo role="type">boolean</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>navig.graphics</refname>
+<refpurpose>Use graphics in navigational headers and footers?</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment id="navig.graphics"><xsl:param name="navig.graphics" select="0"/></src:fragment>
+</refsynopsisdiv>
+
+<refsect1><title>Description</title>
+
+<para>If true (non-zero), the navigational headers and footers in chunked
+HTML are presented in an alternate style that uses
+graphical icons for Next, Previous, Up, and Home.
+Default graphics are provided in the distribution.
+</para>
+
+</refsect1>
+</refentry>
--- /dev/null
+<refentry>
+<refmeta>
+<refentrytitle>navig.showtitles</refentrytitle>
+<refmiscinfo role="type">boolean</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>navig.showtitles</refname>
+<refpurpose>Display titles in HTML headers and footers?</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment id="navig.showtitles"><xsl:param name="navig.showtitles">1</xsl:param></src:fragment>
+</refsynopsisdiv>
+
+<refsect1><title>Description</title>
+
+<para>If true (non-zero),
+the headers and footers of chunked HTML
+display the titles of the next and previous chunks,
+along with the words 'Next' and 'Previous' (or the
+equivalent graphical icons if navig.graphics is true).
+If false (zero), then only the words 'Next' and 'Previous'
+(or the icons) are displayed.
+</para>
+
+</refsect1>
+</refentry>