R help - Oct 2010 - cv.lm only bivariate; other options for prediction intervals

Hi Folks,
I have a pretty simple problem: after building a multivariate linear model,
I need to report my 95% confidence interval for predictions based on future
observations.

I tried doing K-fold cross validation using cv.lm() from the DAAG package,
but it currently only uses the first independent variable in the provided
linear model.  No warnings or anything.  There was a thread about this here
about 3 years ago but the person got no response.  Does anyone know of a
working alternative?

Thanks,
Dan

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