jQuery datepicker with arrival/departure fields.

arrival-departure-datepicker.js

// Arrival Field
$('input.datepicker.arrival').datepicker(
{
	dateFormat: 'mm/dd/yy',
	minDate: 0
});

// Departure Field
$('input.datepicker.departure').datepicker(
{
	dateFormat: 'mm/dd/yy',
	beforeShow: restrictDepartureDate
});

function restrictDepartureDate()
{
	var arrivalDate = $('.arrival.datepicker').datepicker('getDate');
	var arrivalDateYear = $.datepicker.formatDate('yy', arrivalDate);
	var arrivalDateMonth = $.datepicker.formatDate('m', arrivalDate);
	var arrivalDateDay = parseFloat($.datepicker.formatDate('d', arrivalDate));

	$('input.datepicker.departure').datepicker('option', 'minDate', new Date(arrivalDateYear, arrivalDateMonth - 1, arrivalDateDay + 1));
}