The external up link is the one that takes you to the mother web page of the
web pages produced by LaTeX2HTML.  Normally this is the format selection web
page (select.html for l2h or ../index.html for makel2h).

But if you do not need a format selection page, probably since you are not
planning to provide a pdf version for printing purposes, you can just blank
out the up link.  Or make it go to your home page.
