function positionInfo(object) 
{
	var p_elm = object;
	this.getElementLeft = getElementLeft;
	function getElementLeft() 
	{
		var x = 0;
		var elm;
		if(typeof(p_elm) == "object")
		{
			elm = p_elm;
		} 
		else 
		{
			elm = document.getElementById(p_elm);
		}
		while (elm != null) 
		{
			x+= elm.offsetLeft;
			elm = elm.offsetParent;
		}
		return parseInt(x);
	}

	this.getElementWidth = getElementWidth;
	function getElementWidth()
	{
		var elm;
		if(typeof(p_elm) == "object")
		{
			elm = p_elm;
		} 
		else 
		{
			elm = document.getElementById(p_elm);
		}
		return parseInt(elm.offsetWidth);
	}

	this.getElementRight = getElementRight;
	function getElementRight()
	{
		return getElementLeft(p_elm) + getElementWidth(p_elm);
	}

	this.getElementTop = getElementTop;
	function getElementTop() 
	{
		var y = 0;
		var elm;
		if(typeof(p_elm) == "object")
		{
			elm = p_elm;
		} 
		else 
		{
			elm = document.getElementById(p_elm);
		}
		while (elm != null) 
		{
			y+= elm.offsetTop;
			elm = elm.offsetParent;
		}
		return parseInt(y);
	}

	this.getElementHeight = getElementHeight;
	function getElementHeight()
	{
	    var elm;
		if(typeof(p_elm) == "object")
		{
			elm = p_elm;
		} 
		else 
		{
			elm = document.getElementById(p_elm);
		}
		return parseInt(elm.offsetHeight);
	}

	this.getElementBottom = getElementBottom;
	function getElementBottom()
	{
		return getElementTop(p_elm) + getElementHeight(p_elm);
	}
}

function CalendarControl() 
{
	var calendarId = 'CalendarControl';
	var currentYear = 0;
	var currentMonth = 0;
	var currentDay = 0;

	var selectedYear = 0;
	var selectedMonth = 0;
	var selectedDay = 0;

	var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
	var dateField = null;

	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.setDate = setDate;
	function setDate(year, month, day) 
	{
		if (dateField) 
		{
			if (month < 10) 
			{
				month = "0" + month;
			}
			if (day < 10) 
			{
				day = "0" + day;
			}

		    var dateString = month+"-"+day+"-"+year;
			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>";
		}

		table = table + "<tr class='header'><th colspan='7' style='padding: 3px;'><a href='javascript:hideCalendarControl();'>Close</a></td></tr>";
		table = table + "</table>";

		return table;
	}

	this.show = show;
	function show(field) 
	{
		// 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("-");
        				selectedMonth = parseInt(dateParts[0],10);
				selectedDay = parseInt(dateParts[1],10);
				selectedYear = 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);

			setElementProperty('display', 'block', 'CalendarControlIFrame');
			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");
			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;
		}
	}
}

var calendarControl = new CalendarControl();

function showCalendarControl(textField) 
{
	calendarControl.show(textField);
}

function hideCalendarControl() 
{
	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' src='javascript:false;' frameBorder='0' scrolling='no'></iframe>");
//document.write("<div id='CalendarControl'></div>");