var weekend = [5,6];

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

Calendar.Months = ["Enero", "Febrero", "Marzo", "Abril", "Mayo", "Junio", "Julio", "Agosto", "Septiembre", "Octubre", "Noviembre", "Diciembre"];
// 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.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;
}

new Calendar();

Calendar.prototype.getMonthlyCalendarCode = function() {
	var vCode = "";
	var vHeader_Code = "";
	var vData_Code = "";

	// Begin Table Drawing code here..
/*	vCode = vCode + "<TABLE WIDTH='100%' BORDER='0' CELLSPACING=0 CELLPADDING=4>";
	vCode = vCode + "	<table width='100%'  border='0' cellspacing='1' cellpadding='0'>" +
									"		<tr>" +
									"			<td bgcolor='#A4928E'>" +
									"				<TABLE WIDTH='100%' BORDER='0' CELLSPACING=0 CELLPADDING=1>";
*/

	vHeader_Code = this.cal_header();
	vData_Code = this.cal_data();
	vCode = vCode + vHeader_Code + vData_Code;

	vCode = vCode + "				</table>" +
									"			</td>" +
									"		</tr>" +
									"	</TABLE>";

	return vCode;
}

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

	// 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];

	var cadena = "	<table width='100%'  border='0' cellspacing='1' cellpadding='0'>" +
							 "		<tr>" +
							 "			<td bgcolor='#A4928E'>" +
							 "				<TABLE WIDTH='100%' BORDER='0' CELLSPACING=0 CELLPADDING=1>" +
							 "	<TR  bgcolor=#D6BC96>" +
							 "		<TD width='13%'>";
	if (prevMM>=gNow.getMonth() || prevYYYY>gNow.getYear()){
		cadena +=	 "			<div align='center'><A HREF=\"javascript:show_calendar('" + this.gReturnItem + "', '" + prevMM + "', '" + prevYYYY + "', '" + this.gFormat + "');\" class='menuman'>&lt;<\/A></div>";
	}
	cadena += 	 "		</TD>" +
							 "		<TD height='20' colspan=5>" +
							 "			<div align='center' class='txtrojo'>" + this.gMonthName + " " + this.gYear + "</div>" +
							 "		</TD>" +
							 "		<TD ALIGN=center width='14%' CLASS='tdverdeclaro'>" +
							 "			<A HREF=\"javascript:show_calendar('" + this.gReturnItem + "', '" + nextMM + "', '" + nextYYYY + "', '" + this.gFormat + "');\" class='menuman'>&gt;</a><\/A></div>" +
							 "		</TD>" +
							 "	</TR>";

	// Get the complete calendar code for the month..
	cadena += vCode = this.getMonthlyCalendarCode();
	
	return cadena;
}

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

	vCode = vCode + "<TR bgcolor='#F4EDE3' class='contenidobold'>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>L</TD>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>M</TD>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>X</TD>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>J</TD>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>V</TD>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>S</TD>";
	vCode = vCode + "<TD width='20' bgcolor='#F8F5F0' align='center'>D</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() - 1;
	if (vFirstDay == -1) vFirstDay = 6;
	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='#F4EDE3'>";
	for (i=0; i<vFirstDay; i++) {
		vCode = vCode + "<TD ALIGN=center></TD>";
	}

	// Write rest of the 1st week
	for (j=vFirstDay; j<7; j++) {
		vCode = vCode + "<TD WIDTH='14%'ALIGN=center>";
		if(vDay<diaHoy && ((this.gMonth)+1)<=mesHoy && this.gYear<=anoHoy){
			vCode = vCode + vDay +
			"</TD>";
		}
		else{
			vCode = vCode +"<A HREF='#' class='menu' onClick=\"parte('" + this.format_data(vDay) + "');\">" +
				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='#F4EDE3'>";

		for (j=0; j<7; j++) {
			vCode = vCode + "<TD ALIGN=center>";
			if(vDay<diaHoy && ((this.gMonth)+1)<=mesHoy && this.gYear<=anoHoy){
				vCode = vCode + vDay +
				"</TD>";
			}
			else{
				vCode = vCode +"<A HREF='#' class='menu' onClick=\"parte('" + this.format_data(vDay) + "');\">" +
					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++) {
	// El codigo comentado sirve para pintar los primeros dias del mes siguiente
//		if (this.gYearly)
			vCode = vCode + "<TD ALIGN=center></TD>";
//		else
//			vCode = vCode + "<TD WIDTH='14%' ALIGN=center " + this.write_weekend_string(j+m) + "><FONT COLOR='gray'>" + m + "</FONT></TD>";
	}

	return vCode;
}

Calendar.prototype.write_weekend_string = function(vday) {
	var i;
	encontrado = false;
	// Return special formatting for the weekend day.
	
	for (i=0; (i<weekend.length && !encontrado); i++) {
		if (vday == weekend[i])
			encontrado = true;
	}
/*
	if (encontrado)
		return ("class=\"txtverdeclaromed\"");
	else
		return ("class=\"txtverdemed\"");
*/
}

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\/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) {
	gCal = new Calendar(p_item, p_month, p_year, p_format);
	var cadena = gCal.show();
	return cadena;
}

function show_calendar(p_item, p_month, p_year, p_format) {
	/*
		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 = "DD/MM/YYYY";
	else
		p_format = arguments[3];

	cadena = Build(p_item, p_month, p_year, p_format);
	
//	return cadena;
	document.getElementById("celdaCalendario").innerHTML = cadena;
}