insert several pics on one line into latex

\begin{figure}
\centering
\subfigure[p2p]
{
\includegraphics[bb=0 0 483 291, width=0.3\textwidth]{p2p.png}
\label{fig_firstsub}
}
\subfigure[dns]
{
\includegraphics[bb=0 0 483 291, width=0.3\textwidth]{dns.png}
\label{fig_secondsub}
}
\subfigure[ftp]
{
\includegraphics[bb=0 0 483 291, width=0.3\textwidth]{ftp.png}
\label{fig_thirdsub}
}
\caption{applications}
\label{fig}