function CalendarControl() 
{

  var calendarId = 'CalendarControl' ;
  var currentYear = 0;
  var currentMonth = 0;
  var currentDay = 0;

  var selectedYear = 0;
  var selectedMonth = 0;
  var selectedDay = 0;
  var selected_hour = 0 ;
  var selected_minute = 0 ;

  var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
  var dateField = null;
  
  // Time range to show by default. This is the regualr office hours of specific customer to be most probably used
  var show_time = "No" ;
  var time_range_low = 0 ;
  var time_range_up = 23 ;

  this.showTime = showTime ;
  function showTime(show) 
  {
    show_time = show ;
    return ;
  }
  
  this.setTimeRange = setTimeRange ;
  function setTimeRange(start_time , end_time) 
  {
    time_range_low = start_time ;
	time_range_up = end_time ;
  }
  
  function getProperty(p_property){
    var p_elm = calendarId;
    var elm = null;

    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    if (elm != null){
      if(elm.style){
        elm = elm.style;
        if(elm[p_property]){
          return elm[p_property];
        } else {
          return null;
        }
      } else {
        return null;
      }
    }
  }

  function setElementProperty(p_property, p_value, p_elmId){
    var p_elm = p_elmId;
    var elm = null;

    if(typeof(p_elm) == "object"){
      elm = p_elm;
    } else {
      elm = document.getElementById(p_elm);
    }
    if((elm != null) && (elm.style != null)){
      elm = elm.style;
      elm[ p_property ] = p_value;
    }
  }

  function setProperty(p_property, p_value) {
    setElementProperty(p_property, p_value, calendarId);
  }

  function getDaysInMonth(year, month) {
    return [31,((!(year % 4 ) && ( (year % 100 ) || !( year % 400 ) ))?29:28),31,30,31,30,31,31,30,31,30,31][month-1];
  }

  function getDayOfWeek(year, month, day) {
    var date = new Date(year,month-1,day)
    return date.getDay();
  }

  this.clearDate = clearDate;
  function clearDate() {
    dateField.value = '';
    hide();
  }

  // Sets the selected date & time into the bound item on screen
  this.setDate = setDate;
  function setDate(year, month, day) 
  {
    var dateString ;
	
    if (dateField) 
	{
      if (month < 10) {month = "0" + month;}
      if (day < 10) {day = "0" + day;}

	  if (show_time == "No")
        dateString = year + "-" + month + "-" + day ;
	  else if (show_time == "Yes")
	  {
        var current_hour = formatNum(document.getElementById('current_hour').selectedIndex,"99") ;		    
        var current_minute = formatNum(document.getElementById('current_minute').selectedIndex * 5,"99") ;
        dateString = year + "-" + month + "-" + day + " " + current_hour + ":" + current_minute ;
	  }	
		
      dateField.value = dateString;
      hide();
    }
    return;
  }

  this.changeMonth = changeMonth;
  function changeMonth(change) {
    currentMonth += change;
    currentDay = 0;
    if(currentMonth > 12) {
      currentMonth = 1;
      currentYear++;
    } else if(currentMonth < 1) {
      currentMonth = 12;
      currentYear--;
    }

    calendar = document.getElementById(calendarId);
    calendar.innerHTML = calendarDrawTable();
  }

  this.changeYear = changeYear;
  function changeYear(change) {
    currentYear += change;
    currentDay = 0;
    calendar = document.getElementById(calendarId);
    calendar.innerHTML = calendarDrawTable();
  }

  function getCurrentYear() {
    var year = new Date().getYear();
    if(year < 1900) year += 1900;
    return year;
  }

  function getCurrentMonth() {
    return new Date().getMonth() + 1;
  } 

  function getCurrentDay() {
    return new Date().getDate();
  }

  function calendarDrawTable() {

    var dayOfMonth = 1;
    var validDay = 0;
    var startDayOfWeek = getDayOfWeek(currentYear, currentMonth, dayOfMonth);
    var daysInMonth = getDaysInMonth(currentYear, currentMonth);
    var css_class = null; //CSS class for each day

    var table = "<table cellspacing='0' cellpadding='0' border='0'>";
    table = table + "<tr class='header'>";
    table = table + "  <td colspan='2' class='previous'><a href='javascript:changeCalendarControlMonth(-1);'>&lt;</a> <a href='javascript:changeCalendarControlYear(-1);'>&laquo;</a></td>";
    table = table + "  <td colspan='3' class='title'>" + months[currentMonth-1] + "<br>" + currentYear + "</td>";
    table = table + "  <td colspan='2' class='next'><a href='javascript:changeCalendarControlYear(1);'>&raquo;</a> <a href='javascript:changeCalendarControlMonth(1);'>&gt;</a></td>";
    table = table + "</tr>";
    table = table + "<tr><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>";

    for(var week=0; week < 6; week++) {
      table = table + "<tr>";
      for(var dayOfWeek=0; dayOfWeek < 7; dayOfWeek++) {
        if(week == 0 && startDayOfWeek == dayOfWeek) {
          validDay = 1;
        } else if (validDay == 1 && dayOfMonth > daysInMonth) {
          validDay = 0;
        }

        if(validDay) {
          if (dayOfMonth == selectedDay && currentYear == selectedYear && currentMonth == selectedMonth) {
            css_class = 'current';
          } else if (dayOfWeek == 0 || dayOfWeek == 6) {
            css_class = 'weekend';
          } else {
            css_class = 'weekday';
          }

          table = table + "<td><a class='"+css_class+"' href=\"javascript:setCalendarControlDate(" + currentYear + "," + currentMonth + "," + dayOfMonth + ")\">"+dayOfMonth+"</a></td>";
		  
          dayOfMonth++;
        } else {
          table = table + "<td class='empty'>&nbsp;</td>";
        }
      }
      table = table + "</tr>";
    }
    
	// Show time option
	if (show_time == "Yes")
	{
	  table += "<tr class='header'><th colspan='7' style='padding: 3px;'>";
	  table += "<select id='current_hour'>"
	  for (var i = time_range_low ; i <= time_range_up ; i++)
	  {
	    table += "<option" ;
		if (selected_hour == i)
		  table += " selected" ;
		table += ">" + formatNum(i,"99") + "</option>"
	  }	
	  table += "</select> : <select id='current_minute'>";
	  for (var i = 0 ; i <= 55 ; i += 5)
	  {
	    table += "<option" ;
		if (selected_minute == i)
		  table += " selected" ;
		table += ">" + formatNum(i,"99") + "</option>"
	  }	
	  table += "</select></td></tr>";
	}
	
	// Finalize the control
	table = table + "<tr class='header'><th colspan='7' style='padding: 3px;'><a href='javascript:clearCalendarControl();'>Clear</a> | <a href='javascript:hideCalendarControl();'>Close</a></td></tr>";
    table = table + "</table>";

    return table ;
  }

  // Shows the calendar on screen
  this.show = show;
  function show(field) 
  {
    can_hide = 0;
  
    // If the calendar is visible and associated with
    // this field do not do anything.
    if (dateField == field) 
	{
      return;
    } else {
      dateField = field;
    }

    if(dateField) 
	{
      try {
        var dateString = new String(dateField.value);
        var dateParts = dateString.split("-");
        
		if (show_time == "Yes")
		{
		  selected_hour = parseInt(dateString.substr(11,2)) ;
		  // for minute try to find the closest number which is divisable by 5 as we show only by 5 in the minute drop-down
		  selected_minute = Math.round(parseInt(dateString.substr(14,2)) / 5) ;
		  selected_minute = selected_minute.toFixed() * 5 ;
		}
		
        selectedYear = parseInt(dateParts[0],10);
        selectedMonth = parseInt(dateParts[1],10);
        selectedDay = parseInt(dateParts[2],10);
      } catch(e) {}
    }

    if (!(selectedYear && selectedMonth && selectedDay)) {
      selectedMonth = getCurrentMonth();
      selectedDay = getCurrentDay();
      selectedYear = getCurrentYear();
    }

    currentMonth = selectedMonth;
    currentDay = selectedDay;
    currentYear = selectedYear;

    if(document.getElementById){

      calendar = document.getElementById(calendarId);
      calendar.innerHTML = calendarDrawTable(currentYear, currentMonth);

      setProperty('display', 'block');

      var fieldPos = new positionInfo(dateField);
      var calendarPos = new positionInfo(calendarId);

      var x = fieldPos.getElementLeft();
      var y = fieldPos.getElementBottom();

      setProperty('left', x + "px");
      setProperty('top', y + "px");
 
      if (document.all) {
        setElementProperty('display', 'block', 'CalendarControlIFrame');
        setElementProperty('left', x + "px", 'CalendarControlIFrame');
        setElementProperty('top', y + "px", 'CalendarControlIFrame');
        setElementProperty('width', calendarPos.getElementWidth() + "px", 'CalendarControlIFrame');
        setElementProperty('height', calendarPos.getElementHeight() + "px", 'CalendarControlIFrame');
      }
    }
  }

  this.hide = hide;
  function hide() {
    if(dateField) {
      setProperty('display', 'none');
      setElementProperty('display', 'none', 'CalendarControlIFrame');
      dateField = null;
    }
  }

  this.visible = visible;
  function visible() {
    return dateField
  }

  this.can_hide = can_hide;
  var can_hide = 0;
} // CalendarControl()

var calendarControl = new CalendarControl();

function showCalendarControl(textField , show_time) 
{
  // textField.onblur = hideCalendarControl;
  if (show_time == "show_time = Yes")
    calendarControl.showTime("Yes") ;
  calendarControl.show(textField);
}

function clearCalendarControl() {
  calendarControl.clearDate();
}

function hideCalendarControl() {
  if (calendarControl.visible()) {
    calendarControl.hide();
  }
}

function setCalendarControlDate(year, month, day) {
  calendarControl.setDate(year, month, day);
}

function changeCalendarControlYear(change) {
  calendarControl.changeYear(change);
}

function changeCalendarControlMonth(change) {
  calendarControl.changeMonth(change);
}

document.write("<iframe id='CalendarControlIFrame' frameBorder='0' scrolling='no'></iframe>");
document.write("<div id='CalendarControl'></div>");