\documentclass{jarticle}
\usepackage{graphicx}

\makeatletter 
\renewcommand{\thefigure}{% 
\thesection.\arabic{figure}} 
\@addtoreset{figure}{section} 
\makeatother 

\usepackage[FIGBOTCAP]{subfigure} % default
%\usepackage{subfigure}

\begin{document}

\section{test}

\renewcommand*{\thesubfigure}{(\arabic{subfigure})}

\verb|\usepackage[FIGBOTCAP]{subfigure}|

\verb|\usepackage{subfigure}|と同じ

\begin{figure}[htbp]
\centering
\subfigure[左の図]{\includegraphics[width=30mm]{tiger.eps}
 \label{fig:fig01left}
}
\hspace{20mm}
\subfigure[右の図]{\includegraphics[width=20mm]{tiger.eps}
 \label{fig:fig01right}}
\caption{隣り合った2つの図}
\end{figure}

\end{document}
