/* form functions */

var setSelect = SetSelect = function(frm, selectbox, waarde) {
    if (!frm[selectbox] || !frm[selectbox].options) return;
    for (var i = 0; i < frm[selectbox].options.length; i++)
	{
		if (frm[selectbox].options[i].value == waarde || frm[selectbox].options[i].value == '0' + waarde) {
			frm[selectbox].options[i].selected = true;
			break;
		};
	};
};

/* country and city dropdown */

var SelectCountry = function(country, select_city, show_all_cities) {
	if (country == '') country = 'EMPTY';
	var count = select_city.options.length;
	for (var i = 0; i < count; i++) {
		select_city.options[0] = null;
	};
	select_city.options[0] = new Option('', '');
	select_city.options[0].innerHTML = translate_select_city;
	select_city.options[0].selected = true;
	var index = 1;
    if (show_all_cities == null || show_all_cities != false)
    {
	    select_city.options[1] = new Option('', 'ALL');
	    select_city.options[1].innerHTML = translate_all_cities;
	    index = 2;
	}
	for(var i = 0; i < cities.length; i++) {
		if (cities[i][0] == country) {
			select_city.options[index] = new Option('', cities[i][1]);
			select_city.options[index].innerHTML = cities[i][2];
			index++;
		};
	};
}; // end selectCountry

var SelectCity = function(city, select_country, select_city) {
	if (city == 'ALL') {
		var count = select_city.options.length;
		for(i = 0; i < count; i++) {
			select_city.options[0] = null;
		};
		var index = 0;
		for(var i = 0; i < cities.length; i++) {
			if (cities[i][1] != '') {
				select_city.options[index] = new Option('', cities[i][1]);
				select_city.options[index].innerHTML = cities[i][2];
				index++;
			};
		};
		select_country.options[0].selected = true;
	};
}; // end selectCity

var Mod = function(a, b) {
    return a - Math.floor(a / b) * b;
};

var IsLeapYear = function(year) {
    return (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0));
};

var setDaysInMonth = SetDaysInMonth = function(yyyyMM, ddlDay) {
    var month = yyyyMM.substring(5, 7);
	var year = yyyyMM.substring(0, 4);
	var oldday = ddlDay.selectedIndex;
	switch (month) {
		case '02':
			if (IsLeapYear(year)) {
				/* 29 */
				ddlDay.options[30] = null;
				ddlDay.options[29] = null;
			} else {
				/* 28 */
				ddlDay.options[30] = null;
				ddlDay.options[29] = null;
				ddlDay.options[28] = null;
			}
			break;
		case '04':
			/* 30 */
			if (!ddlDay.options[28]) {
				ddlDay.options[28] = new Option('29', '29');
			}
			if (!ddlDay.options[29]) {
				ddlDay.options[29] = new Option('30', '30');
			}
			ddlDay.options[30] = null;
			break;
		case '06':
			/* 30 */
			if (!ddlDay.options[28]) {
				ddlDay.options[28] = new Option('29', '29');
			}
			if (!ddlDay.options[29]) {
				ddlDay.options[29] = new Option('30', '30');
			}
			ddlDay.options[30] = null;
			break;
		case '09':
			/* 30 */
			if (!ddlDay.options[28]) {
				ddlDay.options[28] = new Option('29', '29');
			}
			if (!ddlDay.options[29]) {
				ddlDay.options[29] = new Option('30', '30');
			}
			ddlDay.options[30] = null;
			break;
		case '11':
			/* 30 */
			if (!ddlDay.options[28]) {
				ddlDay.options[28] = new Option('29', '29');
			}
			if (!ddlDay.options[29]) {
				ddlDay.options[29] = new Option('30', '30');
			}
			ddlDay.options[30] = null;
			break;
		default:
			/* 31 */
			if (!ddlDay.options[28]) {
				ddlDay.options[28] = new Option('29', '29');
			}
			if (!ddlDay.options[29]) {
				ddlDay.options[29] = new Option('30', '30');
			}
			if (!ddlDay.options[30]) {
				ddlDay.options[30] = new Option('31', '31');
			}
	} /* end switch */
	var newday = ddlDay.selectedIndex;
	if (oldday != newday) {
		ddlDay.options[ddlDay.options.length - 1].selected = true;
	};
};

var maxLength = function(o, e, len, spn) {
    var span;
    if (spn && (span = document.getElementById(spn))) {
        span.innerHTML = Math.max(len - o.value.length, 0);
    };
    o.value = o.value.substring(0, len);
    return true;
};