[l2h] Natbib citations problem: more info

[V Lakshman]

I tried to convert this file (after having run latex on it).
The citations do not show up in the html document.  Help!  latex2html
doesn't issue any warnings/errors.  

Any ideas?
lakshman

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test.tex:
***************************************************************************
\documentclass{article}
\usepackage{natbib}

\begin{document}

This is just to test whether~\citep{rainfall} works the way it should.

How about~\citet{rainfall}?

\bibliographystyle{plainnat}
\bibliography{testbib}

\end{document}

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testbib.bib:
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@Article{rainfall,
  author =       "Bellon, A. and Zawadzki, I.",
  title =        "Forecasting of Hourly Accumulations of Precipitation
                  by Optimal Extrapolation of Radar Maps",
  journal =      "Journal of Hydrology",
  year =         "1994",
  volume =       "157",
  pages =        "211-233",
}