[R] xtable formatting: RED for negative numbers?

[Ken-JP]

I've been experimenting recently with the fantastic Sweave/xtable combination
for generating latex.  In the xtable vignette, I found this great example of
printing a ts object by months. 

Is there a way to modify this code to generate RED numbers inside xtable for
negative results in x.ts? 
Thanks in advance. 

- Ken 

# Sweave/xtable snippet below
-------------------------------------------------------------- 

\begin{table}[ht] 
<<sample,echo=F,results=tex>>= 
x.ts <- ts(rnorm(100), start = c(1954, 7), frequency = 12) 
x.table <- xtable( x.ts, digits = 1 ) 
print( x.table, floating = FALSE ) 
@ 
\end{table} 
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