// 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.
  cal.sel.focus();
  //alert(cal.sel.id)
  if (cal.dateClicked && cal.sel.id == 'd1') {
  	var el2 = document.getElementById('d2');
	//if (el2.value != '' && )
  } else if (cal.dateClicked && cal.sel.id == 'd2') {
  	
  }
    // 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;
}
// 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();
  today.setHours(0,0,0,0);  
  //return (Math.abs(date.getTime() - today.getTime()) / DAY) > 10;
  // from current date + 1 year
  return (date.getTime() < today.getTime());
}
// 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) {
  
  var today = new Date();
  var format = '%Y-%m-%d';
  var showsOtherMonths = true;
  
  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 (showsOtherMonths) {
      cal.showsOtherMonths = true;
    }
    _dynarch_popupCalendar = cal;                  // remember it in the global var
    cal.setRange(today.getFullYear(), today.getFullYear()+1);        // min/max year allowed.
	// We want some dates to be disabled; see function isDisabled above
	cal.setDisabledHandler(isDisabled);
    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.
  _dynarch_popupCalendar.showAtElement(el, "Tr");        // show the calendar
}