[l2h] Checking whether a label is defined

[Igor Pechtchanski]

Hi, everyone,

I'm attempting to write a macro that would test whether a label being
referenced by a \ref command has been defined.  The following LaTeX
snippet illustrates what I would like to do, but it doesn't work in
LaTeX2HTML:

\newcommand\plabel[1]{\@namedef{p@#1}{}\label{#1}\nobreak\@gobblecr}
\newcommand\plabelref[1]{\@ifundefined{p@#1}{below}{above}~\ref{#1}}

Is there a way to do this test in LaTeX2HTML?  It doesn't have to work in
LaTeX, BTW -- I can put the test in an {htmlonly} environment.
Thanks in advance,
	Igor
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