generating a popup calender in javascript

// written by Tan Ling Wee on 2 Dec 2001
// last updated 10 Apr 2002
// email : fuushikaden@yahoo.com

var fixedX = -1 // x position (-1 if to appear below control)
var fixedY = -1 // y position (-1 if to appear below control)
var startAt = 1 // 0 - sunday ; 1 - monday
var showWeekNumber = 1 // 0 - don't show; 1 - show
var showToday = 1 // 0 - don't show; 1 - show
var imgDir = "images/" // directory for images ... e.g. var imgDir="/img/"

var gotoString = "Go To Current Month"
var todayString = "Today is"
var weekString = "Wk"
var scrollLeftMessage = "Click to scroll to previous month."
var scrollRightMessage = "Click to scroll to next month."
var selectMonthMessage = "Click to select a month."
var selectYearMessage = "Click to select a year."
var selectDateMessage = "Select [date] as date." // do not replace [date], it will be replaced by date.

var crossobj, crossMonthObj, crossYearObj, monthSelected, yearSelected, dateSelected, omonthSelected, oyearSelected, odateSelected, monthConstructed, yearConstructed, intervalID1, intervalID2, timeoutID1, timeoutID2, ctlToPlaceValue, ctlNow, dateFormat, nStartingYear

var bPageLoaded=false
var ie=document.all
var dom=document.getElementById

var ns4=document.layers
var today = new Date()
var dateNow = today.getDate()
var monthNow = today.getMonth()
var yearNow = today.getYear()
var imgsrc = new Array("drop1.gif","drop2.gif","left1.gif","left2.gif","right1.gif","right2.gif")
var img = new Array()

var bShow = false;

/* hides and objects (for IE only) */
function hideElement( elmID, overDiv )
{
if( ie )
{
for( i = 0; i < document.all.tags( elmID ).length; i++ )
{
obj = document.all.tags( elmID )[i];
if( !obj || !obj.offsetParent )
{
continue;
}

// Find the element's offsetTop and offsetLeft relative to the BODY tag.
objLeft = obj.offsetLeft;
objTop = obj.offsetTop;
objParent = obj.offsetParent;

while( objParent.tagName.toUpperCase() != "BODY" )
{
objLeft += objParent.offsetLeft;
objTop += objParent.offsetTop;
objParent = objParent.offsetParent;
}

objHeight = obj.offsetHeight;
objWidth = obj.offsetWidth;

if(( overDiv.offsetLeft + overDiv.offsetWidth ) <= objLeft );
else if(( overDiv.offsetTop + overDiv.offsetHeight ) <= objTop );
else if( overDiv.offsetTop >= ( objTop + objHeight ));
else if( overDiv.offsetLeft >= ( objLeft + objWidth ));
else
{
obj.style.visibility = "hidden";
}
}
}
}

/*
* unhides and objects (for IE only)
*/
function showElement( elmID )
{
if( ie )
{
for( i = 0; i < document.all.tags( elmID ).length; i++ )
{
obj = document.all.tags( elmID )[i];

if( !obj || !obj.offsetParent )
{
continue;
}

obj.style.visibility = "";
}
}
}

function HolidayRec (d, m, y, desc)
{
this.d = d
this.m = m
this.y = y
this.desc = desc
}

var HolidaysCounter = 0
var Holidays = new Array()

function addHoliday (d, m, y, desc)
{
Holidays[HolidaysCounter++] = new HolidayRec ( d, m, y, desc )
}

if (dom)
{
for (i=0;i<

in reference to: Google (view on Google Sidewiki)