\renewcommand{\@makecaption}[2]{%
  \vskip\abovecaptionskip
% \sbox\@tempboxa{{\rm #1:} \footnotesize #2}%
% \sbox\@tempboxa{{\rm #1:} \footnotesize \sl #2}%
  \sbox\@tempboxa{\baselineskip = 15pt plus 1pt minus 1pt\hspace{0.5cm}{\rm #1:} \footnotesize #2\hspace{0.5cm}}%
  \ifdim \wd\@tempboxa >\hsize
    {\footnotesize #1:} {\footnotesize #2}\par
  \else
    \global \@minipagefalse
    \hbox to\hsize{\hfil\box\@tempboxa\hfil}%
  \fi
  \vskip\belowcaptionskip}






