Q regarding using two different font colors when progressing on single overlay

hi All,

sorry for the lengthy subject line.
i found this example by Trand Varslot on using prosper and on one overlay
he has text appearing for the first time in black, and then when he displays
the next item on the overlay, the previous shown text becomes gray.
here is the code (portion) for that overlay

\overlays{5}{
\begin{slide}{Why use Prosper?}

\begin{itemize}
\onlySlide*{1}{
\item {using {\LaTeX} makes sense when you want to reuse some material of an
article written in {\LaTeX} for your slides}
}
\fromSlide*{2}{
\item {\gray using {\LaTeX} makes sense when you want to reuse some material of
an article written in {\LaTeX} for your slides}
}
\onlySlide*{2}{
\item {benefits from the quality of {\LaTeX} formatting at no extra work}
}
...
\end{itemize}
\end{slide}
}

it turns out that this doesn't work with all the styles. in this case, if i
compile
with the autumn style it does indeed work, but with the winter style,
the text just remains black.
with my own style (just a small change on an existing one, so i haven't
bothered sending it in) where i use yellow in blue.
here are the lines that i suppose should be changed

---
\newrgbcolor{mygold}{255 185 0}
\fi
\ifinColor
\ifcolorBG
\let\colC=\mygold %\white
\else
\let\colC=\black
\fi
\else
\let\colC=\black
\fi

\FontText{%
  \usefont{T1}{phv}{m}{n}\fontsize{14.4pt}{14pt}\selectfont\colC}{%
  \usefont{T1}{phv}{m}{n}\fontsize{14.4pt}{14pt}\selectfont\colC}
---

but i cannot see obvious differences when i look at the autumn
and winter styles.
anybody out there who knows how to fix this so that i can have
bright yellow for the first time appearance and then darker yellow
when i go to the next item.

cheers,
arno.




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