var aDayNames = new Array();
	aDayNames[0] = 'ma';
	aDayNames[1] = 'di';
	aDayNames[2] = 'wo';
	aDayNames[3] = 'do';
	aDayNames[4] = 'vr';
	aDayNames[5] = 'za';
	aDayNames[6] = 'zo';
var aMonthNames = new Array();
	aMonthNames[0] = 'januari';
	aMonthNames[1] = 'februari';
	aMonthNames[2] = 'maart';
	aMonthNames[3] = 'april';
	aMonthNames[4] = 'mei';
	aMonthNames[5] = 'juni';
	aMonthNames[6] = 'juli';
	aMonthNames[7] = 'augustus';
	aMonthNames[8] = 'september';
	aMonthNames[9] = 'october';
	aMonthNames[10] = 'november';
	aMonthNames[11] = 'december';
var calFullYear, calMonth;
var calHours, calMinutes;
  
var globalTimeoutId;
var calHTML;
var browserVer;
var rederingCalendarHTML = 0;
var validSelectedDate = false;
var bMarkWeekend = true;

// constants
var cMonday = 0;
var cTuesday = 1;
var cWednesday = 2;
var cThursday = 3;
var cFriday = 4;
var cSaturday = 5;
var cSunday = 6;
  
function buildCalendar(iFullYear, iMonth) {
	var aMonth = new Array();
	aMonth[0] = new Array(7);
	aMonth[1] = new Array(7);
	aMonth[2] = new Array(7);
	aMonth[3] = new Array(7);
	aMonth[4] = new Array(7);
	aMonth[5] = new Array(7);

	var dCalDate = new Date(iFullYear, iMonth-1, 1);
	// Normally sunday is day 0. I want monday as 1st day of the week.
	var iDayOfFirst = (dCalDate.getDay()+6) % 7;
	var iDaysInMonth = fGetDaysInMonth(iFullYear, iMonth);
	var iDaysInPrevMonth = fGetDaysInMonth(iFullYear, iMonth-1);
	var w, d, calendarPos;

	// fill the calendar array
	for (w = 0; w < 6; w++) {
		for (d = 0; d < 7; d++) {
			calendarPos = 7*w + d;
			if (calendarPos < iDayOfFirst) {
				// days before this month
				aMonth[w][d] = iDaysInPrevMonth - (iDayOfFirst - calendarPos) + 1;
			} else if (calendarPos < iDaysInMonth + iDayOfFirst) {
				// days of this month
				aMonth[w][d] = calendarPos - iDayOfFirst + 1;
			} else {
				// days after this month
				aMonth[w][d] = calendarPos - iDaysInMonth - iDayOfFirst + 1;
			}
		}
	}

	return aMonth;
}

function buildWeekNrs(iFullYear, iMonth) {
	var aWeekNrs = new Array(6);
	var iWeekNr, startDateCorrection;

	// date objects used
	var dCalDate = new Date(iFullYear, iMonth-1, 1);
	var dFirstDayOfYearDate = new Date(iFullYear, 0, 1); // 1st jan. this-year
	var dFirstDayOfNextYearDate = new Date(iFullYear+1, 0, 1); // 1st jan. next-year
	var dWeekNrDate;

	var iFirstDayOfMonth = (dCalDate.getDay()+6) % 7; // 0=mo, 1=th, 2=we, ...
	var iFirstDayOfYear = (dFirstDayOfYearDate.getDay()+6) % 7; // 0=mo, 1=th, 2=we, ...
	var iFirstDayOfNextYear = (dFirstDayOfNextYearDate.getDay()+6) % 7; // 0=mo, 1=th, 2=we, ...


	if (iFirstDayOfYear > cThursday) startDateCorrection = 7-iFirstDayOfYear + 1;
	else startDateCorrection = -(iFirstDayOfYear) + 1;

	// set dWeekNrDate to the start of week 1
	dWeekNrDate = new Date(iFullYear, 0, startDateCorrection);
	//alert('startDateCorrection : ' + startDateCorrection + '\nbegin -> Week 1 is : ' + dWeekNrDate);

	if (dCalDate < dWeekNrDate) {
		// last week of last year
		iWeekNr = 0;
	} else {
		iWeekNr = 1;
		dWeekNrDate = new Date(iFullYear, 0, 7 + startDateCorrection);
		while(dWeekNrDate <= dCalDate && iWeekNr < 54) {
			// set dWeekNrDate to the start of week 'iWeekNr'
			//alert('Week ' + iWeekNr + ' is : ' + dWeekNrDate);
			iWeekNr++;
			dWeekNrDate = new Date(iFullYear, 0, (iWeekNr*7) + startDateCorrection);
		}
	}
	
	delete dWeekNrDate;

	// if 1-jan == friday => week = 53
	// if 1-jan == saturday => 
	//		if previous-year == leap-year => week = 53
	//		else => week = 52
	// if 1-jan == sunday => week = 52
	if (iWeekNr == 0) {
		if (iFirstDayOfYear == cFriday) aWeekNrs[0] = 53;
		else if (iFirstDayOfYear == cSunday) aWeekNrs[0] = 52;
		else if (iFirstDayOfYear == cSaturday) {
			if (fIsLeapyear(iFullYear-1)) aWeekNrs[0] = 53;
			else aWeekNrs[0] = 52;
		}
		// (should be no other possibility)
	} else {
		aWeekNrs[0] = iWeekNr;
	}
	aWeekNrs[1] = iWeekNr+1;
	aWeekNrs[2] = iWeekNr+2;
	aWeekNrs[3] = iWeekNr+3;
	if (iMonth == 12) {
		// month is december so check where week 1 starts
		if (iFirstDayOfMonth == cMonday) {
			aWeekNrs[4] = 1;
			aWeekNrs[5] = 2;
		} else {
			aWeekNrs[4] = iWeekNr+4;
			aWeekNrs[5] = 1;
		}
	} else {
		aWeekNrs[4] = iWeekNr+4;
		aWeekNrs[5] = iWeekNr+5;
	}
	return(aWeekNrs);
}




function HourClicked(iHour)
{
  calHours = iHour;
}

function MinuteClicked(iMinute)
{
  calMinutes = iMinute;
}

function fIsLeapyear(iFullYear) {
	if (iFullYear%4 == 0) {
		if (iFullYear%100 != 0 || iFullYear%400 == 0) {
			return true;
		}
	}
	return false;
}

function fGetDaysInMonth(iFullYear, iMonth) {
	var dPrevDate = new Date(iFullYear, iMonth, 0);
	return dPrevDate.getDate();
}

function fDisplayMonthSelect(iMonth) {

}

function fDisplayYearSelect(iYear) {
	
}

function prevMonth() {
	if (calMonth != 1) {
		drawCalendar(calFullYear, calMonth-1);
	} else {
		drawCalendar(calFullYear-1, 12);
	}
}

function nextMonth() {
	if (calMonth != 12) {
		drawCalendar(calFullYear, calMonth+1);
	} else {
		drawCalendar(calFullYear+1, 1);
	}
}

function prevYear() {
	drawCalendar(calFullYear-1, calMonth);
}

function nextYear() {
	drawCalendar(calFullYear+1, calMonth);
}
  
function checkKey() {
eCode = event.keyCode;
switch (eCode) {
	// escape key -> close window
		case 27:	{window.close(); break;}
	// left arrow -> Goto previous month
		case 37:	{prevMonth(); break;}
	// right arrow -> Goto next month
		case 39:	{nextMonth(); break;}
	// down arrow -> Goto today
		case 40:	{drawCalendar(dToday.getFullYear(), dToday.getMonth()+1); break;}
}

return false;
}