cal_old_mousedown = function(){};

function daysInMonth(month, year) {
	switch (month){
		case 2: return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) ? 29 : 28; break;
		case 4: case 6: case 9: case 11: return 30; break;
		default: return 31;	break;
	};
};

function setMyDate(retDay, id, format){
	retMonth= parseInt(DG_gvv('calMonth')); if (retMonth<10) retMonth='0'+retMonth;
	retYear= parseInt(DG_gvv('calYear')); if (parseInt(retDay)<10) retDay='0'+parseInt(retDay);
	format = format.replace('dd',retDay); format = format.replace('mm',retMonth); format = format.replace('yyyy',retYear); DG_svv(id,format); closeCalendar();
};

function closeCalendar(){ document.body.onmousedown = cal_old_mousedown; MM_ocultar(); };
function getMonthName(myMonth) { var mName=DG_gvv('DG_months'+ac()).split(","); return mName[myMonth-1]; };
function viewCalendar(id, format, e ){ cal_old_mousedown = document.body.onmousedown; document.body.onmousedown = ""; MM_nombreDiv="DGdivCalendar"+ac(); MM_mostrar(MM_nombreDiv, e); setCalData(id, format); };
	
function setCalData(id, format, MonthToShow, YearToShow ) {
	var myID=id.split("_AjaxDhtml");
	if (DG_isdefined(myID[1])){
		arrFldData = myID[0].split('.-.');
		var idLen = ac().length; var fldLen = arrFldData[0].length; var fldData = DG_left(arrFldData[0], fldLen - idLen); var origidField = fldData+".-."+arrFldData[1];
		fecha=DG_gvv("i"+ac()+origidField);
	}else{
		fecha=DG_gvv("i"+myID[0]);
	};
	var monthPos = format.indexOf('mm'); month = parseInt(fecha.substr(monthPos,2));	
	var yearPos = format.indexOf('yyyy');year = parseInt(fecha.substr(yearPos,4));
	if(DG_isdefined(MonthToShow) && MonthToShow!="") month=MonthToShow;
	if(DG_isdefined(YearToShow) && YearToShow!="") year=YearToShow;
	year = parseInt(year); month= parseInt(month);
	var now   = new Date();
	if (year==0 || isNaN(year)) year=now.getYear();
	if (month==0 || isNaN(month)) month=now.getMonth()+1;
	year = parseInt(year); month= parseInt(month);
	if (year < 1000) year+=1900;
	month--; if (month > 11) { month-=12; year++;} if (month < 0) { month+=12; year--;};
	var myDate= now.getDate();
	var StartMonth = new Date(year, month, 1);
	var StartMonth = StartMonth.getDay();
	var days = daysInMonth( month + 1, year);
	drawCal(StartMonth + 1, days, myDate, month + 1, year, id, format);
};

function drawCal(firstDay, lastDate, aDate, myMonth, myYear, id, format) {
	var now = new Date();
	lm = myMonth-1; na=la=myYear; if (lm<0) {lm=12; la=myYear-1;};
	nm = myMonth+1; if (nm>12) {nm=1; na=myYear+1;};
	ay = now.getYear(); if (ay < 1000) ay+=1900;
	var strOutput = '<table id="tableCalendar"><tr>';
	strOutput += '<td class="calHeader" colspan="7" align="center" style="cursor:pointer"><a href="javascript:setCalData(\''+id+'\', \''+format+'\', '+lm+','+la+')">&laquo;<\/a>&nbsp;';
	strOutput += '<select id="calMonth" name="calMonth" onchange="setCalData(\''+id+'\', \''+format+'\', this.value,'+myYear+')">';
	for (nMonth=1;nMonth<=12;nMonth++){
		strOutput += '<option value="'+nMonth+'" ';
		if (nMonth==myMonth) strOutput += ' selected="selected" ';
		strOutput += '>'+getMonthName(nMonth)+'<\/option>';
	};
	strOutput += '<\/select>';
	strOutput += '<select id="calYear" name="calYear" onchange="setCalData(\''+id+'\', \''+format+'\', '+myMonth+',this.value)">';
	for (nYear=myYear-25;nYear<=myYear+25;nYear++){
		strOutput += '<option value="'+nYear+'" ';
		if (nYear==myYear) strOutput += ' selected="selected" ';
		strOutput += '>'+nYear+'<\/option>';
	};
	strOutput += '<\/select>';
	strOutput += '&nbsp;<a href="javascript:setCalData(\''+id+'\', \''+format+'\', '+nm+','+na+')">&raquo;<\/a><\/td>';
	strOutput += '<\/tr><tr>';

	var dNames=DG_gvv('DG_days'+ac()).split(",");
	var dName = new Array(7);
	dName[0] = "<abbr title='"+dNames[0]+"'>"+dNames[0].substr(0,1)+"<\/abbr>";
	dName[1] = "<abbr title='"+dNames[1]+"'>"+dNames[1].substr(0,1)+"<\/abbr>";
	dName[2] = "<abbr title='"+dNames[2]+"'>"+dNames[2].substr(0,1)+"<\/abbr>";
	dName[3] = "<abbr title='"+dNames[3]+"'>"+dNames[3].substr(0,1)+"<\/abbr>";
	dName[4] = "<abbr title='"+dNames[4]+"'>"+dNames[4].substr(0,1)+"<\/abbr>";
	dName[5] = "<abbr title='"+dNames[5]+"'>"+dNames[5].substr(0,1)+"<\/abbr>";
	dName[6] = "<abbr title='"+dNames[6]+"'>"+dNames[6].substr(0,1)+"<\/abbr>";

	for (var dayNum = 0; dayNum < 7; ++dayNum) strOutput += '<td class="dayTitles">' + dName[dayNum] + '<\/td>';
	strOutput += '<\/tr>';
	var cDay = curCell = 1;

	endLastMonth=daysInMonth(lm, la);
	SF = endLastMonth - (firstDay - 2);
	
	for (var row = 1; row <= Math.ceil((lastDate + firstDay - 1) / 7); ++row) {
		strOutput += '<tr>';
		for (var col = 1; col <= 7; ++col) {
			if (cDay > lastDate) break;
			if (curCell < firstDay) {
				strOutput += '<td class="nodayCell">'+SF+'<\/td>';SF++;
				curCell++;
			} else {
				var TD_text = '<td class="dayCell" ';
				if (cDay == aDate && myMonth == now.getMonth()+1 && myYear == ay) TD_text = '<td class="todayCell"';
				strOutput += TD_text + ' onclick="setMyDate('+cDay+', \''+id+'\', \''+format+'\')" style="cursor:pointer" >' + cDay + '<\/td>';
				cDay++;
			};
		};
		SF=1; for (colf = col; colf <= 7; ++colf){ strOutput += '<td class="nodayCell">'+SF+'<\/td>'; SF++;};
		strOutput += '<\/tr>';
	};
	strOutput += '<tr><td colspan="7" class="closeCell" align="center"><a href="javascript:closeCalendar()">'+DG_gvv('DGtxtCancel'+ac())+'<\/a><\/td><\/tr><\/table>';
	document.getElementById("DGdivCalendar"+ac()).innerHTML=strOutput;
};