var weekend = [0,6];
var weekendColor = "#e0e0e0";
var fontface = "Verdana";
var fontsize = 8;

var gNow = new Date();
var ggWinContent;
Calendar.Months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

// Non-Leap year Month days..
Calendar.DOMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
// Leap year Month days..
Calendar.lDOMonth = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function Calendar(p_item, p_month, p_year, p_format) {
	if ((p_month == null) && (p_year == null))	return;

	if (p_month == null) {
		this.gMonthName = null;
		this.gMonth = null;
		this.gYearly = true;
	} else {
		this.gMonthName = Calendar.get_month(p_month);
		this.gMonth = new Number(p_month);
		this.gYearly = false;
	}

	this.gYear = p_year;
	this.gFormat = p_format;
	this.gBGColor = "white";
	this.gFGColor = "black";
	this.gTextColor = "black";
	this.gHeaderColor = "black";
	this.gReturnItem = p_item;
}

Calendar.get_month = Calendar_get_month;
Calendar.get_daysofmonth = Calendar_get_daysofmonth;
Calendar.calc_month_year = Calendar_calc_month_year;

function Calendar_get_month(monthNo) {
	return Calendar.Months[monthNo];
}

function Calendar_get_daysofmonth(monthNo, p_year) {
	if ((p_year % 4) == 0) {
		if ((p_year % 100) == 0 && (p_year % 400) != 0)
			return Calendar.DOMonth[monthNo];
	
		return Calendar.lDOMonth[monthNo];
	} else
		return Calendar.DOMonth[monthNo];
}

function Calendar_calc_month_year(p_Month, p_Year, incr) {
	var ret_arr = new Array();
	if (incr == -1) {
		if (p_Month == 0) {
			ret_arr[0] = 11;
			ret_arr[1] = parseInt(p_Year) - 1;
		} else {
			ret_arr[0] = parseInt(p_Month) - 1;
			ret_arr[1] = parseInt(p_Year);
		}
	} else if (incr == 1) {
		if (p_Month == 11) {
			ret_arr[0] = 0;
			ret_arr[1] = parseInt(p_Year) + 1;
		} else {
			ret_arr[0] = parseInt(p_Month) + 1;
			ret_arr[1] = parseInt(p_Year);
		}
	}
	return ret_arr;
}

function Calendar_calc_month_year(p_Month, p_Year, incr) {
	var ret_arr = new Array();
	if (incr == -1) {
		if (p_Month == 0) {
			ret_arr[0] = 11;
			ret_arr[1] = parseInt(p_Year) - 1;
		} else {
			ret_arr[0] = parseInt(p_Month) - 1;
			ret_arr[1] = parseInt(p_Year);
		}
	} else if (incr == 1) {
		if (p_Month == 11) {
			ret_arr[0] = 0;
			ret_arr[1] = parseInt(p_Year) + 1;
		} else {
			ret_arr[0] = parseInt(p_Month) + 1;
			ret_arr[1] = parseInt(p_Year);
		}
	}
	return ret_arr;
}

new Calendar();

Calendar.prototype.getMonthlyCalendarCode = function() {
	var vCode = "";
	var vHeader_Code = "";
	var vData_Code = "";
	vCode += ("<div align=center><TABLE BORDER=0 BGCOLOR=\"" + this.gBGColor + "\" style='font-size:" + fontsize + "pt;'>");
	vHeader_Code = this.cal_header();
	vData_Code = this.cal_data();
	vCode += (vHeader_Code + vData_Code);
	vCode += "</TABLE></div>";
	return vCode;
}

Calendar.prototype.show = function() {
	var vCode = "";
	var prevMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, -1);
	var prevMM = prevMMYYYY[0];
	var prevYYYY = prevMMYYYY[1];
	var nextMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, 1);
	var nextMM = nextMMYYYY[0];
	var nextYYYY = nextMMYYYY[1];
	ggWinContent += ("<TABLE WIDTH='100%' BORDER=0 CELLSPACING=0 CELLPADDING=0 BGCOLOR='#e0e0e0' style='font-size:" + fontsize + "pt;'><TR>");
	ggWinContent += ("<TD width=16><A href=\"javascript:void(0);\" " +
		"onClick=\"parent.Build(" +
		"'" + this.gReturnItem + "', '" + prevMM + "', '" + prevYYYY + "', '" + this.gFormat + "'" +
		");" +
		"\"><IMG src='\/AdminImages\/back_16.gif' border=0 align=absMiddle><\/A></TD>");
	ggWinContent += ("<TD ALIGN=center>" +
	    "<FONT FACE='" + fontface + "'>" +
        "<B>"+ this.gMonthName + " " + this.gYear +"</B>" +
        "</TD>");
	ggWinContent += ("<TD width=16><A href=\"javascript:void(0);\" " +
		"onClick=\"parent.Build(" +
		"'" + this.gReturnItem + "', '" + nextMM + "', '" + nextYYYY + "', '" + this.gFormat + "'" +
		");" +
		"\"><IMG src='\/AdminImages\/next_16.gif' border=0 align=absMiddle><\/A></TD>");
    ggWinContent +=  "</TR></TABLE>";
	vCode = this.getMonthlyCalendarCode();
	ggWinContent += vCode;
}

Calendar.prototype.cal_header = function() {
	var vCode = "";
	vCode = vCode + "<TR>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>S</B></FONT></TD>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>M</B></FONT></TD>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>T</B></FONT></TD>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>W</B></FONT></TD>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>T</B></FONT></TD>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>F</B></FONT></TD>";
	vCode = vCode + "<TD style='border:1px solid #999999' bgColor=#F3F3F3 align=center WIDTH='16%'><FONT FACE='" + fontface + "' COLOR='" + this.gHeaderColor + "'><B>S</B></FONT></TD>";
	vCode = vCode + "</TR>";
	return vCode;
}

Calendar.prototype.cal_data = function() {
	var vDate = new Date();
	vDate.setDate(1);
	vDate.setMonth(this.gMonth);
	vDate.setFullYear(this.gYear);
	var vFirstDay=vDate.getDay();
	var vDay=1;
	var vLastDay=Calendar.get_daysofmonth(this.gMonth, this.gYear);
	var vOnLastDay=0;
	var vCode = "";
	vCode = vCode + "<TR>";
	for (i=0; i<vFirstDay; i++) {
		vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(i) + "><FONT FACE='" + fontface + "'>&nbsp;</FONT></TD>";
	}
	for (j=vFirstDay; j<7; j++) {
		vCode = vCode + "<TD style='border:1px solid #cccccc' align=center WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "'>" +
			"<A style='text-decoration:none; color:blue' href='javascript:void(0);' " +
				"onClick=\"parent.document." + this.gReturnItem + ".value='" + this.format_data(vDay) +
				"';parent.hideCalendar();\">" +
				this.format_day(vDay) + 
			"</A>" + 
			"</FONT></TD>";
		vDay=vDay + 1;
	}
	vCode = vCode + "</TR>";
	for (k=2; k<7; k++) {
		vCode = vCode + "<TR>";
		for (j=0; j<7; j++) {
			vCode = vCode + "<TD style='border:1px solid #cccccc' align=center WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "'>" + 
				"<A style='text-decoration:none; color:blue' href='javascript:void(0);' " +
					"onClick=\"parent.document." + this.gReturnItem + ".value='" + 
					this.format_data(vDay) + 
					"';parent.hideCalendar()\">" +
				this.format_day(vDay) + 
				"</A>" + 
				"</FONT></TD>";
			vDay=vDay + 1;
			if (vDay > vLastDay) {
				vOnLastDay = 1;
				break;
			}
		}
		if (j == 6)
			vCode = vCode + "</TR>";
		if (vOnLastDay == 1)
			break;
	}
	for (m=1; m<(7-j); m++) {
		if (this.gYearly)
			vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j+m) + 
			"><FONT FACE='" + fontface + "' COLOR='gray'>&nbsp;</FONT></TD>";
		else
			vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j+m) + 
			"><FONT FACE='" + fontface + "' COLOR='gray'>&nbsp;</FONT></TD>";
	}
	return vCode;
}

Calendar.prototype.format_day = function(vday) {
	var vNowDay = gNow.getDate();
	var vNowMonth = gNow.getMonth();
	var vNowYear = gNow.getFullYear();
	if (vday == vNowDay && this.gMonth == vNowMonth && this.gYear == vNowYear)
		return ("<FONT COLOR=\"RED\"><B>" + vday + "</B></FONT>");
	else
		return (vday);
}

Calendar.prototype.write_weekend_string = function(vday) {
	var i;
	for (i=0; i<weekend.length; i++) {
		if (vday == weekend[i])
			return (" BGCOLOR=\"" + weekendColor + "\"");
	}
	return "";
}

Calendar.prototype.format_data = function(p_day) {
	var vData;
	var vMonth = 1 + this.gMonth;
	vMonth = (vMonth.toString().length < 2) ? "0" + vMonth : vMonth;
	var vMon = Calendar.get_month(this.gMonth).substr(0,3).toUpperCase();
	var vFMon = Calendar.get_month(this.gMonth).toUpperCase();
	var vY4 = new String(this.gYear);
	var vY2 = new String(this.gYear.substr(2,2));
	var vDD = (p_day.toString().length < 2) ? "0" + p_day : p_day;
	switch (this.gFormat) {
		case "MM\/DD\/YYYY" :
			vData = vMonth + "\/" + vDD + "\/" + vY4;
			break;
		case "MM\/DD\/YY" :
			vData = vMonth + "\/" + vDD + "\/" + vY2;
			break;
		case "MM-DD-YYYY" :
			vData = vMonth + "-" + vDD + "-" + vY4;
			break;
		case "YYYY-MM-DD" :
			vData = vY4 + "-" + vMonth + "-" + vDD;
			break;
		case "MM-DD-YY" :
			vData = vMonth + "-" + vDD + "-" + vY2;
			break;
		case "DD\/MON\/YYYY" :
			vData = vDD + "\/" + vMon + "\/" + vY4;
			break;
		case "DD\/MON\/YY" :
			vData = vDD + "\/" + vMon + "\/" + vY2;
			break;
		case "DD-MON-YYYY" :
			vData = vDD + "-" + vMon + "-" + vY4;
			break;
		case "DD-MON-YY" :
			vData = vDD + "-" + vMon + "-" + vY2;
			break;
		case "DD\/MONTH\/YYYY" :
			vData = vDD + "\/" + vFMon + "\/" + vY4;
			break;
		case "DD\/MONTH\/YY" :
			vData = vDD + "\/" + vFMon + "\/" + vY2;
			break;
		case "DD-MONTH-YYYY" :
			vData = vDD + "-" + vFMon + "-" + vY4;
			break;
		case "DD-MONTH-YY" :
			vData = vDD + "-" + vFMon + "-" + vY2;
			break;
		case "DD\/MM\/YYYY" :
			vData = vDD + "\/" + vMonth + "\/" + vY4;
			break;
		case "DD\/MM\/YY" :
			vData = vDD + "\/" + vMonth + "\/" + vY2;
			break;
		case "DD-MM-YYYY" :
			vData = vDD + "-" + vMonth + "-" + vY4;
			break;
		case "DD-MM-YY" :
			vData = vDD + "-" + vMonth + "-" + vY2;
			break;
		default :
			vData = vMonth + "\/" + vDD + "\/" + vY4;
	}

	return vData;
}

var calendarObj = window.createPopup();
var posX, posY
function Build(p_item, p_month, p_year, p_format) {
	gCal = new Calendar(p_item, p_month, p_year, p_format);
	// Customize your Calendar here..
	gCal.gBGColor="white";
	gCal.gLinkColor="black";
	gCal.gTextColor="black";
	gCal.gHeaderColor="#666666";

	ggWinContent = "";
	gCal.show();
	calendarObj.document.body.innerHTML = ggWinContent;
	calendarObj.document.body.style.margin = 2;
	calendarObj.document.body.style.backgroundColor = "#FFFFFF";
	calendarObj.document.body.style.cursor = "default";
	calendarObj.document.body.style.border = "1px solid #ACA899"
	calendarObj.document.body.style.fontFamily = "Tahoma, Arial, Helvetica, sans-serif"
	calendarObj.document.body.style.color = "#000000"
	calendarObj.show(posX, posY, 150, 156, document.body);
}
function hideCalendar(){
	calendarObj.hide();
}
function returnFalse(){
	return false;
}

function show_calendar(fieldObj) {

	p_item = fieldObj;
	if (arguments[1] == null)
		p_month = new String(gNow.getMonth());
	else
		p_month = arguments[1];
	if (arguments[2] == "" || arguments[2] == null)
		p_year = new String(gNow.getFullYear().toString());
	else
		p_year = arguments[2];
	if (arguments[3] == null)
		p_format = "DD/MM/YYYY";// "YYYY/MM/DD";
	else
		p_format = arguments[3];
	posX = event.x
	posY = event.y
	Build(p_item, p_month, p_year, p_format);
}