on your page, there will be code similar to this:
$(function(){
$('#datepicker_1').datepicker({
dateFormat: 'mm/dd/yy',
showAnim: 'show',
onClose: closeDatePicker_datepicker_1
});
});
that creates the date picker object.
you can add minDate and maxDate arguments to restrict the date range that will be displayed by the date picker:
$(function(){
$('#datepicker_1').datepicker({
dateFormat: 'mm/dd/yy',
showAnim: 'show',
onClose: closeDatePicker_datepicker_1,
minDate: new Date(2010, 0, 1),
maxDate: new Date(2012, 11, 31)
});
});
this sets the available date range to 1/1/2010 and 12/31/2012