var oldLink = null;
// code to change the active stylesheet
function setActiveStyleSheet(link, title) {

    var i, a, main;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {

        if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
            a.disabled = true;
            if (a.getAttribute("title") == title) a.disabled = false;
        }
    }
    if (oldLink) oldLink.style.fontWeight = 'normal';
    oldLink = link;
    link.style.fontWeight = 'bold';
    return false;
}

// This function gets called when the end-user clicks on some date.
function selected(cal, date) {
    cal.sel.value = date; // just update the date in the input field.
    if (cal.dateClicked && (cal.sel.id == "sel1" || cal.sel.id == "sel3"))
    // if we add this call we close the calendar on single-click.
    // just to exemplify both cases, we are using this only for the 1st
    // and the 3rd field, while 2nd and 4th will still require double-click.
        cal.callCloseHandler();
}

// And this gets called when the end-user clicks on the _selected_ date,
// or clicks on the "Close" button.  It just hides the calendar without
// destroying it.
function closeHandler(cal) {
    cal.hide();                        // hide the calendar
    //  cal.destroy();
    _dynarch_popupCalendar = null;
}

// This function shows the calendar under the element having the given id.
// It takes care of catching "mousedown" signals on document and hiding the
// calendar if the click was outside.
function showCalendar(id, format, showsTime, showsOtherMonths) {
    
    var el = document.getElementById(id);
    if (_dynarch_popupCalendar != null) {
        // we already have some calendar created
        _dynarch_popupCalendar.hide();                 // so we hide it first.
    } else {
        // first-time call, create the calendar.

        var cal = new Calendar(1, null, selected, closeHandler);

        // uncomment the following line to hide the week numbers
        // cal.weekNumbers = false;
        if (typeof showsTime == "string") {
            cal.showsTime = true;
            cal.time24 = (showsTime == "24");
        }
        if (showsOtherMonths) {
            cal.showsOtherMonths = true;
        }


        _dynarch_popupCalendar = cal;                  // remember it in the global var

        cal.setRange(1900, 2070);        // min/max year allowed.

        cal.create();

    }
    _dynarch_popupCalendar.setDateFormat(format);    // set the specified date format
    _dynarch_popupCalendar.parseDate(el.value);      // try to parse the text in field
    _dynarch_popupCalendar.sel = el;                 // inform it what input field we use
    
    // the reference element that we pass to showAtElement is the button that
    // triggers the calendar.  In this example we align the calendar bottom-right
    // to the button.
    var p = Calendar.getAbsolutePos(el);
    _dynarch_popupCalendar.showAt(p.x , p.y + 25);
    //_dynarch_popupCalendar.showAtElement(el,"Br");        // show the calendar

    return false;
}

var MINUTE = 60 * 1000;
var HOUR = 60 * MINUTE;
var DAY = 24 * HOUR;
var WEEK = 7 * DAY;

// If this handler returns true then the "date" given as
// parameter will be disabled.  In this example we enable
// only days within a range of 10 days from the current
// date.
// You can use the functions date.getFullYear() -- returns the year
// as 4 digit number, date.getMonth() -- returns the month as 0..11,
// and date.getDate() -- returns the date of the month as 1..31, to
// make heavy calculations here.  However, beware that this function
// should be very fast, as it is called for each day in a month when
// the calendar is (re)constructed.
function isDisabled(date) {
    var today = new Date();
    return (Math.abs(date.getTime() - today.getTime()) / DAY) > 10;
}

function flatSelected(cal, date) {
    var el = document.getElementById("preview");
    el.innerHTML = date;
}

function showFlatCalendar() {
    var parent = document.getElementById("display");

    // construct a calendar giving only the "selected" handler.
    var cal = new Calendar(0, null, flatSelected);

    // hide week numbers
    cal.weekNumbers = false;

    // We want some dates to be disabled; see function isDisabled above
    cal.setDisabledHandler(isDisabled);
    cal.setDateFormat("%A, %B %e");

    // this call must be the last as it might use data initialized above; if
    // we specify a parent, as opposite to the "showCalendar" function above,
    // then we create a flat calendar -- not popup.  Hidden, though, but...
    cal.create(parent);

    // ... we can show it here.
    cal.show();
}