Trata-se de uma função orientada ao objeto que retorna o código HTML para o mês ou ano especificado.

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/*
 *   Função calendário:
 *
 *   Retorna o código HTML para montar um calendário de um mês ou ano
 *
 *  Cal.monthCal( [month , year] )
 *  Cal.yearCal( [year] )
 *  Cal.setMonth( [month [, year] )
 *  Cal.setYear( [year] )
 *
 *   month = 0...11 | 'today' | 'next' | 'prev' | 'now'
 *   year  = number | 'today' | 'next' | 'prev' | 'now'
 */

function Calendar(name,year,month){
   this.Month = Today.getMonth();
   this.Year = Today.Year;
   this.ThisDate = 0;
   this.weekHeadMonth = new Array("Dom","Seg","Ter","Qua","Qui","Sex","Sab");
   this.weekHeadYear = new Array("D","S","T","Q","Q","S","S");
   this.monthNames = new Array("Janeiro","Fevereiro","Março","Abril","Maio",
   "Junho","Julho","Agosto","Setembro","Outubro","Novembro","Dezembro");
   this.firstDay = 0;
   this.weekColor = "black";
   this.weekendColor = "red";
   this.bgColor = "";
   this.borderMonth = 2;
   this.spacingMonth = 1;
   this.paddingMonth = 2;
   this.borderYear = 3;
   this.spacingYear = 2;
   this.paddingYear = 7;
   this.cellWidth = 0;
   this.fontFamily = "arial";
   this.fontSize = 3;
   this.fontWeight = "plain";
   this.todayFontColor = "";
   this.todayFontSize = 3;
   this.todayFontWeight = "strong";
   this.headFontColor = "black";
   this.headFontFamily = "arial";
   this.headFontSize = 3;
   this.headFontWeight = "strong";

   this.monthLen = Calendar.monthLen;
   this.monthName = Calendar.monthName;
   this.setMonthNames = Calendar.setMonthNames;
   this.setYearWeek = Calendar.setYearWeek;
   this.setMonthWeek = Calendar.setMonthWeek;
   this.monthCal = Calendar.monthCal;
   this.setMonth = Calendar.setMonth;
   this.setYear = Calendar.setYear;
   this.yearCal = Calendar.yearCal;

   if (!window.calendars) window.calendars = new Array();
   this.name = name || "Calendar"+ window.calendars.length;
   window.calendars[this.name] = this;
   window.calendars[window.calendars.length] = this;

   this.setMonth(month,year);
}

Calendar.monthLen = function() {
   var len = ((this.Month % 7) % 2 == 1)? 30 : 31;
   if (this.Month == 1) len = (this.Year % 4 == 0)? 29 : 28;
   return len;
}

Calendar.monthName = function() {
   return this.monthNames[this.Month];
}

Calendar.setMonthNames = function() {
   var args = Calendar.setMonthNames.arguments;
   for (var i = 0; i<args.length; i++)
      this.monthNames[i] = args[i];
}

Calendar.setYearWeek = function(su,mo,tu,we,th,fr,sa) {
   var args = Calendar.setYearWeek.arguments;
   for (var i = 0; i<args.length; i++)
      this.weekHeadYear[i] = args[i];
}

Calendar.setMonthWeek = function(su,mo,tu,we,th,fr,sa) {
   var args = Calendar.setMonthWeek.arguments;
   for (var i = 0; i<args.length; i++)
      this.weekHeadMonth[i] = args[i];
}

Calendar.setMonth = function(month, year) {
   if (month) {
      if(typeof(month) == 'number' && (month >= 0 && month < 12))
         this.Month = month;
      else if (month == 'today') {
         this.Year = Today.Year;
         this.Month = Today.getMonth();
      }
      else if (month == 'prev') {
         if (--this.Month == -1) {
            this.Month = 11;
            --this.Year;
         }
      }
      else if (month == 'next') {
         if (++this.Month == 12) {
            this.Month = 0;
            ++this.Year;
         }
      }
      else if (month != 'now')
         alert('Unknown month: '+ month);
   }
   if (typeof(year) != 'undefined')  this.setYear(year);
   this.ThisDate = (this.Month == Today.getMonth() && this.Year == Today.Year)?  Today.getDate() : 0;
}

Calendar.setYear = function(year) {
   if(typeof(year) != 'undefined') {
      if (typeof(year) == 'number') {
         this.Year = (year < 100 && year >= 0)?  year + 1900 : year;
      }
      else if (year == 'today')
         this.Year = Today.Year;
      else if (year == 'prev')
         --this.Year;
      else if (year == 'next')
         ++this.Year;
      else if (year != 'now')
         alert('Unknown year: '+ year);
   }
   this.ThisDate = 0;
}

Calendar.monthCal = function(month, year) {
   this.setMonth(month, year);
   var first = new Date(this.Year,this.Month,1);
   var day = 0;
   var lastDate = this.monthLen();
   var color;
   var str = '<TABLE WIDTH='+ (7*this.cellWidth + 8*this.spacingMonth + 14*this.paddingMonth) +' CELLSPACING='+ this.spacingMonth +' CELLPADDING='+ this.paddingMonth +' BORDER='+ this.borderMonth +' BGCOLOR="'+ this.bgColor +'">';
   str += '<TR><TH COLSPAN=7>'+ fontTag(this.headFontFamily,this.headFontSize,this.headFontColor,this.headFontWeight) +
          this.monthName() +'  '+ this.Year +'</FONT></TH></TR>\n<TR ALIGN="center">\n';
   for (day=this.firstDay; day<this.firstDay+7; day++)
      str += ' <TD WIDTH='+ this.cellWidth +'>'+ fontTag(this.fontFamily,this.fontSize,this.headFontColor,this.headFontWeight) +
             this.weekHeadMonth[day%7] +'</FONT></TD>';
   day = first.getDay();
   if (day != this.firstDay) {
      str += '\n</TR>\n<TR ALIGN="center">\n' +
         ' <TD COLSPAN='+ ((day+7-this.firstDay)%7) +'> </TD>';
   }
   for (date=1; date <= lastDate; date++, day=(++day)%7) {
      if (day == this.firstDay)
         str += '\n</TR>\n<TR ALIGN="center">\n';
      str += ' <TD WIDTH='+ this.cellWidth +'>';
      color = (day==0 || day==6)? this.weekendColor : this.weekColor;
      if (date == this.ThisDate) {
         color = this.todayFontColor || color;
        str += fontTag(this.fontFamily, this.todayFontSize, color, this.todayFontWeight);
      } else {
        str += fontTag(this.fontFamily, this.fontSize, color, this.fontWeight);
      }
      str += date +'</FONT></TD>';
   }
   if ((this.firstDay-day)%7 != 0 )
      str += ' <TD COLSPAN='+ ((this.firstDay+7-day)%7) +'> </TD>';
   str += '\n</TR>\n</TABLE>\n';
   return str;
}
Calendar.yearCal = function (year) {
   this.setYear(year);
   var saveMonth = this.Month;
   var saveBorder = this.borderMonth;
   this.borderMonth = 0;
   var saveWeekHead = this.weekHeadMonth;
   this.weekHeadMonth = this.weekHeadYear;
   var str = '<TABLE BORDER="'+ this.borderYear +'" CELLPADDING='+ this.paddingYear +' CELLSPACING="'+ this.spacingYear +' BGCOLOR="'+ this.bgColor +'">\n' +
         '<CAPTION><H2>'+ fontTag(this.headFontFamily,'',this.headFontColor,this.headFontWeight) + this.Year +'</H2></CAPTION>\n';
   for (var row = 0; row < 4; row++) {
      str += '<TR VALIGN=TOP>\n';
      for (this.Month = 3*row; this.Month < 3*row + 3; this.Month++)
         str += '<TD>'+ this.monthCal() +'</TD>\n';
      str += '</TR>\n';
   }
   str += '</TABLE>\n';
   this.Month = saveMonth;
   this.borderMonth = saveBorder;
   this.weekHeadMonth = saveWeekHead;
   return str;
}

function fontTag(family,size,color,weight) {
   var font = '<FONT';
   if (family) font += ' FACE="'+ family +'"';
   if (size) font += ' SIZE="'+ size +'"';
   if (color) font += ' COLOR="'+ color +'"';
   font += '>'
   if (weight && weight != "plain") font += '<'+ weight +'>';
   return font;
}

if (!Today) var Today = new Date();
if (!Today.Year) {
   Today.Year = Today.getYear() % 100;
   Today.Year += (Today.Year < 38) ? 2000 : 1900;
}

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