Thank you Tom and Jonathan for your responses.
I am now looking at the stylesheet.xsl from after 9.6, and I do see these lines in the file:
<div class="navheader">
<xsl:if test="$row1 or $row2">
<table width="100%" summary="Navigation header">
The generated html files clearly have a div tag and a table tag that match this. So I can understand what generates the header.
What baffles me is that the generated html files also include these tags at the bottom of each file:
<div class="navfooter"><hr />
<table width="100%" summary="Navigation footer">
I do not see anything in stylesheet.xsl that looks anything like this.
Does anyone know where the "magic incantations" are that generate this navfooter?
...Rick Swagerman