book with parts

book.tex

\documentstyle[11pt]{book}

\newenvironment{tubainapart}
{	
	\hrule
	\Huge\bf \begin{center}
}
{
	\end{center}
	\hrule
}

\begin{document}

\tableofcontents

\cleardoublepage
\addcontentsline{toc}{part}{Titulo da parte 1}
\thispagestyle{empty}

\begin{tubainapart}Titulo da parte 1\end{tubainapart}

\chapter{capitulo 1}
\section{blablabla}



\chapter{capitulo 2}
\section{blablabla}

\chapter{capitulo 3}
\section{blablabla}

\cleardoublepage
\addcontentsline{toc}{part}{Titulo da parte 2}
\thispagestyle{empty}
\begin{tubainapart}Titulo da parte 2\end{tubainapart}



\chapter{capitulo 4}
\section{blablabla}




\end{document}