[l2h] transparent math

[desouza@math.berkeley.edu]

How does one do "transparent" math formulas under latex2html ? 
I tried to look for the answer in the manual and the expected stuff:

	latex2html -transparent test

on the file:

------------------------------------------------------------
\documentclass{report}

\begin{document}

This is a formula $\frac{dx}{dt} = 2 \alpha + \beta$.

\end{document}
------------------------------------------------------------

to no avail, I still get the grey-box around the formula,
as it can be seen at:

	http://www.math.berkeley.edu/~desouza/test/test.html

Paulo Ney