[OS X TeX] problem with natbib in spanish

[Sr Sur]

Hi people,

I am a new user of Latex. I have installed Mac TeX with the Tex Live '08
version. I'm writing my PhD thesis in spanish and I have problems with
natbib package. when I \cite a reference with two authors the output is
"Freeman and Bermudez (year)" but the correct way in spanish would be
"Freeman y Bermudez (year)". How can I put the "spanish y" instead "and"???

thanks!!!


Isaac
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