/*
*
* Copyright (c) 2010 Nick Busey (http://nickabusey.com/)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
*
* Version 1.0.1
* 
*/
(function ($) {
    $.fn.dateSelectBoxes = function (month, day, year) {
        var allDays =
				{
				    "1": "1", "2": "2", "3": "3",
				    "4": "4", "5": "5", "6": "6",
				    "7": "7", "8": "8", "9": "9",
				    "10": "10", "11": "11", "12": "12",
				    "13": "13", "14": "14", "15": "15",
				    "16": "16", "17": "17", "18": "18",
				    "19": "19", "20": "20", "21": "21",
				    "22": "22", "23": "23", "24": "24",
				    "25": "25", "26": "26", "27": "27",
				    "28": "28", "29": "29", "30": "30",
				    "31": "31"
				};
        function isLeapYear() {
            var selected = $("#" + year).selectedValues();
            return (selected == "" || ((selected % 4 == 0) && (selected % 100 != 0)) || (selected % 400 == 0));
        }
        function updateDays() {
            var selected = $("#" + day).selectedValues();
            $("#" + day).removeOption(/./);
            var days = {};
            switch (parseInt($("#" + month).val())) {
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    for (i = 1; i <= 31; i++) {
                        days[i] = allDays[i]
                    }
                    break;
                case 2:
                    var febDays = 0;
                    if (isLeapYear())
                        febDays = 29;
                    else
                        febDays = 28;
                    for (i = 1; i <= febDays; i++) {
                        days[i] = allDays[i]
                    }
                    break;
                case 4:
                case 6:
                case 9:
                case 11:
                    for (i = 1; i <= 30; i++) {
                        days[i] = allDays[i]
                    }
                    break;
            }
            $("#" + day).addOption(days, false);
            $("#" + day).selectOptions(selected);
        }
        $("#" + year).change(function () {
            updateDays();
        });
        $("#" + month).change(function () {
            updateDays();
        });
    };
})(jQuery);