Problem with JQuery DatePicker

Hi,
I´m using a JQuery with UI (DatePicker) in my site, but I have a
simple problem with DatePicker Calendar (this problem is the same of
demo (http://dev.jquery.com/view/trunk/ui/demos/functional/
#ui.datepicker), I using Pt-Br configuration, put when I display
february/2009 month the calendar display double 14th day.
Insite de demo site, the calendar was display in October / 2008
double 11th day....
Can help me about this problem.....
I´m using the last stable version of JQuery and JQuery UI
Tks,
Alexandre Oliveira