suppress page number output for \part in tableofcontents

gistfile1.tex

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tocloft}
\title{42}
\author{Jane Doe}
\date{June 2011}

\begin{document}



\maketitle
\tableofcontents
\newpage
\addtocontents{toc}{\cftpagenumbersoff{part}}
\part{no page number for this part}
\addtocontents{toc}{\cftpagenumberson{part}}

less than

\section{Introduction}

\part{page number for this part}

\chapter{more chapter}

\end{document}