var weekend = [0];
var weekendColor = "#ffffff";

var gNow = new Date();
var ggWinCal;
isNav = (navigator.appName.indexOf("Netscape") != -1) ? true : false;
isIE = (navigator.appName.indexOf("Microsoft") != -1) ? true : false;

Calendar.Months = ["01", "02", "03", "04", "05", "06",
"07", "08", "09", "10", "11", "12"];

// 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_WinCal, p_month, p_year, p_format) {
	if ((p_month == null) && (p_year == null))	return;

	if (p_WinCal == null)
		this.gWinCal = ggWinCal;
	else
		this.gWinCal = p_WinCal;
	
	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 = "#CCCCCC";
	this.gFGColor = "#CCCCCC";
	this.gTextColor = "white";
	this.gHeaderColor = "white";
	this.gReturnItem = p_item;
}

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

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

function Calendar_get_daysofmonth(monthNo, p_year) {
	/* 
	Check for leap year ..
	1.Years evenly divisible by four are normally leap years, except for... 
	2.Years also evenly divisible by 100 are not leap years, except for... 
	3.Years also evenly divisible by 400 are leap years. 
	*/
	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) {
	/* 
	Will return an 1-D array with 1st element being the calculated month 
	and second being the calculated year 
	after applying the month increment/decrement as specified by 'incr' parameter.
	'incr' will normally have 1/-1 to navigate thru the months.
	*/
	var ret_arr = new Array();
	
	if (incr == -1) {
		// B A C K W A R D
		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) {
		// F O R W A R D
		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_print() {
	ggWinCal.print();
}

function Calendar_calc_month_year(p_Month, p_Year, incr) {
	/* 
	Will return an 1-D array with 1st element being the calculated month 
	and second being the calculated year 
	after applying the month increment/decrement as specified by 'incr' parameter.
	'incr' will normally have 1/-1 to navigate thru the months.
	*/
	var ret_arr = new Array();
	
	if (incr == -1) {
		// B A C K W A R D
		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) {
		// F O R W A R D
		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;
}

// This is for compatibility with Navigator 3, we have to create and discard one object before the prototype object exists.
new Calendar();

Calendar.prototype.getMonthlyCalendarCode = function() {
	var vCode = "";
	var vHeader_Code = "";
	var vData_Code = "";
	
	vCode = vCode + "<TABLE BORDER=0 BGCOLOR=\"" + this.gBGColor + "\">";
	vHeader_Code = this.cal_header();
	vData_Code = this.cal_data();
	vCode = vCode + vHeader_Code + vData_Code;
	vCode = vCode + "</TABLE>";
	return vCode;
}

Calendar.prototype.show = function() {
var vCode = "";
this.gWinCal.document.open();

this.wwrite("<html>");
this.wwrite("<head><title>Calendar</title>");
this.wwrite("<link href=\"../admin.css\" rel=\"stylesheet\" media=\"print, projection, screen\" type=\"text/css\" />");
this.wwrite("</head>");
this.wwrite("<body><center>");

	// Show navigation buttons
	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];
	
	this.wwrite("<TABLE WIDTH=150 BORDER=0 CELLSPACING=0 CELLPADDING=0><TR><TD>");
	this.wwrite("<TABLE WIDTH=100%  BORDER=0 CELLSPACING=0 CELLPADDING=1 BGCOLOR='#CCCCCC'>");
	this.wwrite("<TR bgcolor='#FFFFFF'><TD ALIGN=center width=15% class=lnk2><A HREF=\"" +	"javascript:window.opener.Build(" + 
		"'" + this.gReturnItem + "', '" + this.gMonth + "', '" + (parseInt(this.gYear)-1) + "', '" + this.gFormat + "'" +
		");" + "\"><strong>&lt;<\/strong><\/A></TD>");
	this.wwrite("<TD ALIGN=center class=txtbig>" + this.gYear + "</TD>");
	this.wwrite("<TD ALIGN=center width=15% class=lnk2><A HREF=\"" +	"javascript:window.opener.Build(" + 
		"'" + this.gReturnItem + "', '" + this.gMonth + "', '" + (parseInt(this.gYear)+1) + "', '" + this.gFormat + "'" +
		");" + "\"><strong>&gt;<\/strong><\/A></TD></TR>");
		
	this.wwrite("<TR bgcolor=#FFFFFF><TD ALIGN=center><A HREF=\"" +	"javascript:window.opener.Build(" + 
		"'" + this.gReturnItem + "', '" + prevMM + "', '" + prevYYYY + "', '" + this.gFormat + "'" +
		");" + "\"><img src='../aimages/arrow_left.gif' width=16 height=16 border=0><\/A></TD>");
	this.wwrite("<TD ALIGN=center class=txtm3 >" + this.gMonthName + "</TD>");
	this.wwrite("<TD ALIGN=center><A HREF=\"" +
		"javascript:window.opener.Build(" + 
		"'" + this.gReturnItem + "', '" + nextMM + "', '" + nextYYYY + "', '" + this.gFormat + "'" +
		");" +
		"\"><img src='../aimages/arrow_right.gif' width=16 height=16 border=0><\/A></TD></TR></TABLE>");

	// Get the complete calendar code for the month..
	vCode = this.getMonthlyCalendarCode();
	this.wwrite(vCode);
	this.wwrite("</td></tr></table></center></body></html>");
	this.gWinCal.document.close();
}

Calendar.prototype.wwrite = function(wtext) {
	this.gWinCal.document.writeln(wtext);
}

Calendar.prototype.wwriteA = function(wtext) {
	this.gWinCal.document.write(wtext);
}

Calendar.prototype.cal_header = function() {
	var vCode = "";
	vCode = vCode + "<TR bgcolor='#CCCCCC' class='txtbig'>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>Su</TD>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>Mo</TD>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>Tu</TD>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>We</TD>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>Th</TD>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>Fr</TD>";
	vCode = vCode + "<TD ALIGN='CENTER' WIDTH='14%'>Sa</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 = "";

	/*
	Get day for the 1st of the requested month/year..
	Place as many blank cells before the 1st day of the month as necessary. 
	*/

	vCode = vCode + "<TR bgcolor='#FFFFFF' class='txtm2'>";
	for (i=0; i<vFirstDay; i++) {
		vCode = vCode + "<TD " + this.write_weekend_string(i) + "> </TD>";
	}

	// Write rest of the 1st week
	for (j=vFirstDay; j<7; j++) {
		vCode = vCode + "<TD ALIGN='CENTER'" + this.write_weekend_string(j) + ">" + 
			"<A HREF='#' " + 
				"onClick=\"self.opener.document." + this.gReturnItem + ".value='" + 
				this.format_data(vDay) + "';window.close();\">" + 
				this.format_day(vDay) + 
			"</A>" + 
			"</TD>";
		vDay=vDay + 1;
	}
	vCode = vCode + "</TR>";

	// Write the rest of the weeks
	for (k=2; k<7; k++) {
		vCode = vCode + "<TR bgcolor='#FFFFFF' class='txtm2'>";

		for (j=0; j<7; j++) {
			vCode = vCode + "<TD ALIGN='CENTER'" + this.write_weekend_string(j) + ">" + 
				"<A HREF='#' " + 
					"onClick=\"self.opener.document." + this.gReturnItem + ".value='" + 
					this.format_data(vDay) + "';window.close();\">" + 
					this.format_day(vDay) + 
				"</A>" + 
				"</TD>";
			vDay=vDay + 1;
			if (vDay > vLastDay) {
				vOnLastDay = 1;
				break;
			}
		}
		if (j == 6)
			vCode = vCode + "</TR>";
		if (vOnLastDay == 1)
			break;
	}
	
	// Fill up the rest of last week with proper blanks, so that we get proper square blocks
	for (m=1; m<(7-j); m++) {
		vCode = vCode + "<TD " + this.write_weekend_string(j+m) + "> </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;
	// Return special formatting for the weekend day.
	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 "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 MON YYYY" :
			vData = vDD + " " + vMon + " " + vY4;
			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;
}

function Build(p_item, p_month, p_year, p_format) {
	var p_WinCal = ggWinCal;
	gCal = new Calendar(p_item, p_WinCal, p_month, p_year, p_format);

	// Customize your Calendar here..
	gCal.gBGColor="#CCCCCC";
	gCal.gLinkColor="#ffffff";
	gCal.gTextColor="black";
	gCal.gHeaderColor="white";
	gCal.show();
}

function show_calendar() {
	/* 
		p_month : 0-11 for Jan-Dec; 12 for All Months.
		p_year	: 4-digit year
		p_format: Date format (mm/dd/yyyy, dd/mm/yy, ...)
		p_item	: Return Item.
	*/

	p_item = arguments[0];
	if (arguments[1] == "" || 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] == "" || arguments[3] == null)
		p_format = "DD\/MM\/YYYY";
	else
		p_format = arguments[3];

	vWinCal = window.open("", "Calendar","width=180,height=200,status=no,resizable=no,top=200,left=200");
	vWinCal.opener = self;
	ggWinCal = vWinCal;

	Build(p_item, p_month, p_year, p_format);
}

function clear_calendar(field_name) {
	eval("document.forms."+field_name+".value = 'dd/mm/yy'") ;
}

function isValidDate(dateStr, format, errorstring) {
	if (dateStr == "dd/mm/yy") {return true;}
	if (format == null) {format = "MDY";}
	format = format.toUpperCase();
	if (format.length != 3) {format = "MDY";}
	if ((format.indexOf("M") == -1)||(format.indexOf("D") == -1)||(format.indexOf("Y") == -1)) {format = "MDY";}
	if (format.substring(0, 1) == "Y") { // If the year is first
		var reg1 = /^\d{2}(\-|\/|\.)\d{1,2}\1\d{1,2}$/
		var reg2 = /^\d{4}(\-|\/|\.)\d{1,2}\1\d{1,2}$/
	} else if (format.substring(1, 2) == "Y") { // If the year is second
		var reg1 = /^\d{1,2}(\-|\/|\.)\d{2}\1\d{1,2}$/
		var reg2 = /^\d{1,2}(\-|\/|\.)\d{4}\1\d{1,2}$/
	} else { // The year must be third
		var reg1 = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{2}$/
		var reg2 = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{4}$/
	}
	// If it doesn't conform to the right format (with either a 2 digit year or 4 digit year), fail
	if ((reg1.test(dateStr) == false) && (reg2.test(dateStr) == false)) {
		alert(errorstring);
		return false;
	}
	var parts = dateStr.split(RegExp.$1); // Split into 3 parts based on what the divider was
	// Check to see if the 3 parts end up making a valid date
	if (format.substring(0, 1) == "M") {var mm = parts[0];} 
	else 
		if (format.substring(1, 2) == "M") {var mm = parts[1];}
		else {var mm = parts[2];}
	if (format.substring(0, 1) == "D") {var dd = parts[0];} 
	else
		if (format.substring(1, 2) == "D") {var dd = parts[1];} 
		else {var dd = parts[2];}
	if (format.substring(0, 1) == "Y") {var yy = parts[0];} 
	else
		if (format.substring(1, 2) == "Y") {var yy = parts[1];} 
		else {var yy = parts[2];}
	if (parseFloat(yy) <= 50) {yy = (parseFloat(yy) + 2000).toString();}
	if (parseFloat(yy) <= 99) {yy = (parseFloat(yy) + 1900).toString();}
	var dt = new Date(parseFloat(yy), parseFloat(mm)-1, parseFloat(dd), 0, 0, 0, 0);
	if (parseFloat(dd) != dt.getDate()) {
		alert(errorstring);
		return false;
	}
	if (parseFloat(mm)-1 != dt.getMonth()) {
		alert(errorstring);
		return false;
	}
	return true;
}