var DatePicked = function() {
                var departure = $("#departure");
                var arrival = $("#arrival");
                var nights = $("#nights");

                var triggeringElement = $(this);

                var departureDate = departure.datepicker("getDate");

                var minArrivalDate = new Date();
                if (departureDate != null) {
                        minArrivalDate.setTime(departureDate.getTime() + 86400000);
                } else {
                        minArrivalDate.setTime(minArrivalDate.getTime() + 181439999);
                }
                arrival.datepicker('option', 'minDate', minArrivalDate);

                var arrivalDate = arrival.datepicker("getDate");

                if (departureDate != null && arrivalDate != null && triggeringElement.attr("id") != "nights") {
                        var oneDay = 1000*60*60*24;
                        var difference = Math.ceil((arrivalDate.getTime() - departureDate.getTime()) / oneDay);
                        nights.val(difference);
                } else if (departureDate != null && triggeringElement.attr("id") == "nights") {
                        var nightsEntered = parseInt(nights.val());
                        if (nightsEntered >= 1) {
                                var newArrivalDate = new Date();
                                newArrivalDate.setDate(departureDate.getDate() + nightsEntered);
                                arrival.datepicker("setDate", newArrivalDate);
                        } else {
                                alert("Nights must be greater than 1.");
                        }
                }
        }
        $(function() {
                $("#departure, #arrival").datepicker({
			minDate: "0d",
			 maxDate: "+2y", 
			 showOn: "both",
			showAnim: "drop",
			showButtonPanel: true,
			buttonText: 'Choose a date',
			buttonImage: "../common/img/pixtrans.gif",
			buttonImageOnly: true,
			numberOfMonths: 2,
                        onSelect: DatePicked
                });
                $("#nights").change(DatePicked);
                DatePicked();
        });