[R-sig-ME] multilevel analysis with sample weighted data

[Rodrigo Travitzki]

Dear R masters,
I'm looking for a R package to do multilevel analysis of a weighted data 
(is a weigthed sample of brazilian educational data) but could not find 
it. There is just a "weights" option in lme(), but is not about 
frequency (or probability) weigths in data. In some foruns, no response 
either.
So, could you please confirm this information for me? There is any R 
package/function which do this? I really don't want to use proprietary 
software, but if there is no option, I'll need to do so.
Thank you very much.

Best wishes,
Rodrigo Travitzki