\newcommand{\startmymenu}{\HCode{
     <footer class="navbar navbar-default navbar-fixed-bottom copyleft-navbar">\Hnewline
       <div class="container">\Hnewline
     <nav class="collapse navbar-collapse copyleft-navbar-collapse" role="navigation">\Hnewline
     <ul class="nav navbar-nav navbar-left">\Hnewline
      <li><a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">License: CC By SA 4.0 International</a></li>\Hnewline}}

\newcommand{\selectmulti}{\HCode{<li class="active"><a href="/guide">HTML</a></li>\Hnewline
       <li><a href="/guide/monolithic">HTML (1 page)</a></li>\Hnewline}}
\newcommand{\selectmonolith}{\HCode{<li><a href="/guide/">HTML</a></li>\Hnewline
       <li><a class="active"><a href="/guide/monolithic">HTML (1 page)</a></li>\Hnewline}}

\newcommand{\finishmymenu}{\HCode{<li><a href="/guide/comprehensive-gpl-guide.pdf">PDF</a></li>\Hnewline
       <li><a href="/guide/comprehensive-gpl-guide.ps">Postscript</a></li>\Hnewline
       </ul>\Hnewline}}

\:CheckOption{monolith} \if:Option
   \newcommand{\monolith}{\Configure{@BODY}{\startmymenu\selectmonolith\finishmymenu\HCode{</nav></div></footer>}}}
 \else
   \newcommand{\monolith}{}
 \fi