Calendar.setup = function (params) {
	function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };param_default("inputField",      null);	param_default("displayArea",null);	param_default("button",null);param_default("eventName",       "click");param_default("ifFormat","%Y/%m/%d");	param_default("daFormat","%Y/%m/%d");param_default("singleClick",true);
	param_default("disableFunc",     null);	param_default("dateStatusFunc",  params["disableFunc"]);param_default("dateText",null);	param_default("firstDay",null);	param_default("align","Br");param_default("range",[1000, 3000]);param_default("weekNumbers",     true);	param_default("flat",null);
	param_default("flatCallback",    null);	param_default("onSelect", null);param_default("onClose",null);	param_default("onUpdate", null);param_default("date",null);	param_default("showsTime",false);param_default("timeFormat",      "24");	param_default("electric",true);	param_default("step",            2);param_default("position",        null);param_default("showOthers",      false);param_default("multiple",        null);param_default("dateType",        "gregorian");param_default("ifDateType",null);param_default("langNumbers",false);param_default("autoShowOnFocus", false);param_default("autoFillAtStart", false);var tmp = ["inputField", "displayArea", "button"];
	for (var i in tmp) {
		if (typeof params[tmp[i]] == "string") {
			params[tmp[i]] = document.getElementById(params[tmp[i]]);
		}
	}
	if (!(params.flat || params.multiple || params.inputField || params.displayArea || params.button)) {
		alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
		return false;
	}
	if (params.autoFillAtStart) {
		if (params.inputField && !params.inputField.value)
			params.inputField.value = new Date(params.date).print(params.ifFormat, params.ifDateType || params.dateType, params.langNumbers);
		if (params.displayArea && !params.displayArea.innerHTML)
			params.displayArea.innerHTML = new Date(params.date).print(params.ifFormat, params.ifDateType || params.dateType, params.langNumbers);
	}
	function onSelect(cal) {
		var p = cal.params;
		var update = (cal.dateClicked || p.electric);
		if (update && p.inputField) {
			p.inputField.value = cal.date.print(cal.dateFormat, p.ifDateType || cal.dateType, cal.langNumbers);
			if (typeof p.inputField.onchange == "function")
				p.inputField.onchange();
		}
		if (update && p.displayArea)
			p.displayArea.innerHTML = cal.date.print(p.daFormat, cal.dateType, cal.langNumbers);
		if (update && typeof p.onUpdate == "function")
			p.onUpdate(cal);
		if (update && p.flat) {
			if (typeof p.flatCallback == "function")
				p.flatCallback(cal);
		}
		if (update && p.singleClick && cal.dateClicked)
			cal.callCloseHandler();
	};
	if (!params.flat) {
		var cal = new Calendar(params.firstDay,
									params.date,
									params.onSelect || onSelect,
									params.onClose || function(cal) { cal.hide(); });

	} else {
		if (typeof params.flat == "string")
			params.flat = document.getElementById(params.flat);
		if (!params.flat) {
			alert("Calendar.setup:\n  Flat specified but can't find parent.");
			return false;
		}
		var cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect);

		if (params.inputField && typeof params.inputField.value == "string" && params.inputField.value) {
			cal.parseDate(params.inputField.value, null, params.ifDateType || cal.dateType);
		}
	}
	cal.showsTime = params.showsTime;
	cal.time24 = (params.timeFormat == "24");
	cal.weekNumbers = params.weekNumbers;
	cal.dateType = params.dateType;
	cal.langNumbers = params.langNumbers;
	cal.showsOtherMonths = params.showOthers;
	cal.yearStep = params.step;
	cal.setRange(params.range[0], params.range[1]);
	cal.params = params;
	cal.setDateStatusHandler(params.dateStatusFunc);
	cal.getDateText = params.dateText;
	cal.setDateFormat(params.inputField ? params.ifFormat : params.daFormat);
	if (params.multiple) {
		cal.multiple = {};
		for (var i = params.multiple.length; --i >= 0;) {
			var d = params.multiple[i];
			var ds = d.print("%Y%m%d", cal.dateType, cal.langNumbers);
			cal.multiple[ds] = d;
		}
	}
	if (!params.flat) {
		var triggerEl = params.button || params.displayArea || params.inputField;
		triggerEl["on" + params.eventName] = function() {
			if (!cal.element) cal.create();
			var dateEl = params.inputField || params.displayArea;
			var dateType = params.inputField ? params.ifDateType || cal.dateType : cal.dateType;
			if (dateEl && (dateEl.value || dateEl.innerHTML)) params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, cal.dateFormat, dateType);
			if (params.date) cal.setDate(params.date);
			cal.refresh();
			if (!params.position)
				cal.showAtElement(params.button || params.displayArea || params.inputField, params.align);
			else
				cal.showAt(params.position[0], params.position[1]);
			return false;
		};

		if (params.autoShowOnFocus && params.inputField) {
			params.inputField["onfocus"] = triggerEl["on" + params.eventName];
		};
	} else {
		cal.create(params.flat);
		cal.show();
	}
	return cal;
};