var weekend = [0,6];

var gNow = new Date();
var ggWinContent;
var ggNavContent;
var ggPosX = -1;
var ggPosY = -1;

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.gMonth = new Number(p_month);
		this.gMonthName = Calendar.get_month(this.gMonth);
		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) {
	/* 
	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_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 = "";
	
	// Begin Table Drawing code here..
	vCode += ("<div id=\"jsCalDisplay\"><table cellspacing=\"0\" cellpadding=\"0\">");
	
	vHeader_Code = this.cal_header();
	vData_Code = this.cal_data();
	vCode += (vHeader_Code + vData_Code);
	
	vCode += "</div></div>";
	
	return vCode;
}

Calendar.prototype.show = function() {
	var vCode = "";

	// build content into global var ggWinContent
	ggWinContent += ("<div class=\"jsCalCurrentMonth\">");
	ggWinContent += (this.gMonthName + " " + this.gYear);
	ggWinContent += ("</div>");
	
	// 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];

	// Get the complete calendar code for the month, and add it to the
	//	content var
	vCode = this.getMonthlyCalendarCode();
	ggWinContent += vCode;
	
	ggNavContent = "";
	this.cal_nav(prevMM, prevYYYY, nextMM, nextYYYY);
}

Calendar.prototype.cal_nav = function (prevMonth, prevYear, nextMonth, nextYear) {
//	ggNavContent += ("<div id=\"jsCalNav\">");
	ggNavContent += ("<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr>");
	ggNavContent += ("<td><span class=\"jsCalPrev\" " +
		"onclick=\"Build(" + 
		"'" + this.gReturnItem + "', '" + this.gMonth + "', '" + (parseInt(this.gYear)-1) + "', '" + this.gFormat + "'" +
		");" +
		"\">&nbsp;</span>");
	ggNavContent += ("<span class=\"jsCalNext\" " +
		"onclick=\"Build(" + 
		"'" + this.gReturnItem + "', '" + this.gMonth + "', '" + (parseInt(this.gYear)+1) + "', '" + this.gFormat + "'" +
		");" +
		"\">&nbsp;</span>");
	ggNavContent += ("<span>Year</span>");	
	ggNavContent += ("<div class=\"clearer\">&nbsp;</div>");	
	ggNavContent += ("</td>");
	ggNavContent += ("<td><span class=\"jsCalPrev\" " +
		"onclick=\"Build(" + 
		"'" + this.gReturnItem + "', '" + prevMonth + "', '" + prevYear + "', '" + this.gFormat + "'" +
		");" +
		"\">&nbsp;</span>");
	ggNavContent += ("<span class=\"jsCalNext\" " +
		"onclick=\"Build(" + 
		"'" + this.gReturnItem + "', '" + nextMonth + "', '" + nextYear + "', '" + this.gFormat + "'" +
		");" +
		"\">&nbsp;</span>");
	ggNavContent += ("<span>Month</span>");	
	ggNavContent += ("<div class=\"clearer\">&nbsp;</div>");
	ggNavContent += ("</td>");
	ggNavContent += ("</tr></table>");
//	ggNavContent += ("</div>");
}

Calendar.prototype.cal_header = function() {
	var vCode = "";
	
	vCode = vCode + "<tr>";
	vCode = vCode + "<th>Sun</th>";
	vCode = vCode + "<th>Mon</th>";
	vCode = vCode + "<th>Tue</th>";
	vCode = vCode + "<th>Wed</th>";
	vCode = vCode + "<th>Thu</th>";
	vCode = vCode + "<th>Fri</th>";
	vCode = vCode + "<th>Sat</th>";
	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>";
	for (i=0; i<vFirstDay; i++) {
		vCode += "<td " + this.write_weekend_string(i) + "></td>";
	}

	// Write rest of the 1st week
	for (j=vFirstDay; j<7; j++) {
		vCode = vCode + "<td " + this.write_weekend_string(j) + 				
				"onclick=\"setDateForm(document." + this.gReturnItem + "Month, document." + this.gReturnItem + "Day, document." + this.gReturnItem + "Year, '"
				+ this.format_data(vDay, "D")+"', '" + this.format_data(vDay, "M")+"', '" + this.format_data(vDay, "YYYY")+"');" 
				+ "cClick();ggPosX=-1;ggPosY=-1;\">" + 
				this.format_day(vDay) + 
			"</td>";
		vDay++;
	}
	vCode += "</tr>";

	// Write the rest of the weeks
	for (k=2; k<7; k++) {
		vCode += "<tr>";

		for (j=0; j<7; j++) {
			vCode = vCode + "<td " + this.write_weekend_string(j) + 
				"onclick=\"setDateForm(document." + this.gReturnItem + "Month, document." + this.gReturnItem + "Day, document." + this.gReturnItem + "Year, '"
				+ this.format_data(vDay, "D")+"', '" + this.format_data(vDay, "M")+"', '" + this.format_data(vDay, "YYYY")+"');" 
				+ "cClick();ggPosX=-1;ggPosY=-1;\">" + 
				this.format_day(vDay) + 
				"</td>";
			vDay++;

			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 += "<td " + this.write_weekend_string(j+m) + " style=\"color: gray;\">";
		if (!this.gYearly)			
			vCode += m;
		vCode += "</td>";
	}
	
	return vCode;
}
function setDateForm(monthField, dayField, yearField, day, month, year) {
	monthField.value = month;
	dayField.value = day;
	yearField.value = year;
}

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 ("<span class=\"jsCalCurDay\">" + vday + "</span>");
	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 ("class=\"jsCalWeekend\"");		
	}
	return ("class=\"jsCalWeekday\"");	
}

Calendar.prototype.format_data = function(p_day, format) {
	var vData;
	var vMonth = 1 + this.gMonth;
	vM = vMonth;
	vMonth = (vMonth.toString().length < 2) ? "0" + vMonth : vMonth;
	
	var vY4 = new String(this.gYear);
	var vDD = (p_day.toString().length < 2) ? "0" + p_day : p_day;	
	var vD = p_day;	
	switch (format) {
		case "DD":
			vData = vDD;
			break;
		case "D":
			vData = vD;
			break;
		case "MM":
			vData = vMonth;
			break;
		case "M":
			vData = vM;
			break;
		case "YYYY":
			vData = vY4;
			break;
		case "YYYY-MM-DD" :
			vData = vY4 + "-" + vMonth + "-" + vDD;
			break;
		default :
			vData = vMonth + "/" + vDD + "/" + vY4;
	}

	return vData;
}

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="darkgreen";

	// initialize the content string
	ggWinContent = "";

	gCal.show();
	// if this is the first calendar popup, use autopositioning with an offset
	if (ggPosX == -1 && ggPosY == -1) {
		overlib(ggWinContent, AUTOSTATUSCAP, STICKY, CLOSECLICK, CSSSTYLE,			
			CAPTION, ggNavContent, OFFSETX, 20, OFFSETY, -20);
		// save where the 'over' div ended up; we want to stay in the same place if the user
		//	clicks on one of the year or month navigation links
		if ( (ns4) || (ie4) ) {
		        ggPosX = parseInt(over.left);
		        ggPosY = parseInt(over.top);
			} else if (ns6) {
			ggPosX = parseInt(over.style.left);
			ggPosY = parseInt(over.style.top);
			}
	}
	else {
		// we have a saved X & Y position, so use those with the FIXX and FIXY options
		overlib(ggWinContent, AUTOSTATUSCAP, STICKY, CLOSECLICK, CSSSTYLE,
			CAPTION, ggNavContent, FIXX, ggPosX, FIXY, ggPosY);
	}
}
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] == 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 = "YYYY-MM-DD";
	else
		p_format = arguments[3];

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

function explodeArray(item,delimiter) {
  tempArray=new Array(1);
  var Count=0;
  var tempString=new String(item);

  while (tempString.indexOf(delimiter)>0) {
    tempArray[Count]=tempString.substr(0,tempString.indexOf(delimiter));
    tempString=tempString.substr(tempString.indexOf(delimiter)+1,tempString.length-tempString.indexOf(delimiter)+1); 
    Count=Count+1
  }

  tempArray[Count]=tempString;
  return tempArray;
}