[tex4ht] unicode HTML title

[Jaroslav Sobota]

In MikTeX 2.9 under Windows, I'm trying to generate unicode HTML version 
of a book with the command

htlatex mybook.tex "xhtml,charset=utf-8" " -cunihtf -utf8" "-cvalidate"

Everything works fine, except the accented letters in the 
<title></title> element. The accents simply disappear.

Why does it happen and is there a way to avoid it?

Thanks for any hints,
Jaroslav
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\documentclass[a4paper,11pt]{book}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\begin{document}
\title{Ä?ščĹ?žýáíĂ?úůďťĹ?ĂĽĂ? ĚŠČĹ?ŽÝĂ?ĂŤĂ?ĂšĹ?ĎŤĹ?ĂśĂ? - accent, caron, umlaut}
\author{Author Name}
\date{26.5.2013}
\maketitle{}

Book content in Czech language, containing letters with hatches and accents: Ä?ščĹ?žýáíĂ?úůďťĹ?ĂĽĂ? ĚŠČĹ?ŽÝĂ?ĂŤĂ?ĂšĹ?ĎŤĹ?ĂśĂ?...

Felis justo nunc et a Curabitur nec habitasse Nullam dolor gravida.
Fusce elit libero eget Curabitur condimentum amet facilisi diam
eleifend Pellentesque. Enim In hac ut sapien a ac at Pellentesque
laoreet Donec. Curabitur pellentesque felis leo Ut fringilla
sollicitudin tristique eros at malesuada.
\end{document}