var months = new Array("一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"); 
var daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); 
var days = new Array("日","一", "二", "三", "四", "五", "六"); 
var today; 

document.writeln("<div id='Calendar' style='left:0;top:0;position:absolute; z-index:1; visibility: hidden; filter:\"progid:DXImageTransform.Microsoft.Shadow(direction=135,color=#999999,strength=3)\"'></div>");

function getDays(month, year){ 
	if (1 == month) return ((0 == year % 4) && (0 != (year % 100))) || (0 == year % 400) ? 29 : 28; 
	else return daysInMonth[month]; 
} 
function getToday() { 
	this.now = new Date(); 
	this.year = this.now.getFullYear(); 
	this.month = this.now.getMonth(); 
	this.day = this.now.getDate(); 
}
function getStringDay(str) { 
	var str=str.split("-")
	this.now = new Date(parseFloat(str[0]),parseFloat(str[1])-1,parseFloat(str[2])); 
	this.year = this.now.getFullYear(); 
	this.month = this.now.getMonth(); 
	this.day = this.now.getDate(); 
}
function newCalendar() { 
	var parseYear = parseInt(document.all.Year.options[document.all.Year.selectedIndex].value); 
	var newCal = new Date(parseYear, document.all.Month.selectedIndex, 1); 
	var day = -1; 
	var startDay = newCal.getDay(); 
	var daily = 0; 
	if ((today.year == newCal.getFullYear()) &&(today.month == newCal.getMonth())) day = today.day; 
	var tableCal = document.all.calendar; 
	var intDaysInMonth =getDays(newCal.getMonth(), newCal.getFullYear());
	for (var intWeek = 1; intWeek < tableCal.rows.length;intWeek++) 
		for (var intDay = 0;intDay < tableCal.rows[intWeek].cells.length;intDay++) { 
			var cell = tableCal.rows[intWeek].cells[intDay]; 
			if ((intDay == startDay) && (0 == daily)) daily = 1; 
			if(day==daily) {
				cell.style.background='#6699CC';
				cell.style.color='#FFFFFF';
			}
			else if(intDay==6) cell.style.color='green'; 
			else if (intDay==0) cell.style.color='red';
			if ((daily > 0) && (daily <= intDaysInMonth)) { 
				cell.innerText = daily; 
				daily++; 
			} else cell.innerText = ""; 
		} 
} 
function GetDate(InputBox){ 
	var sDate; 
	if (event.srcElement.tagName == "TD") 
		if (event.srcElement.innerText != "") { 
			sDate = document.all.Year.value + "-" + document.all.Month.value + "-" + event.srcElement.innerText;
			eval("document.all."+InputBox).value=sDate;
			HiddenCalendar();
		} 
} 
function HiddenCalendar(){
	document.all.Calendar.style.visibility='hidden';
}
function ShowCalendar(InputBox){
	var x,y,intLoop,intWeeks,intDays;
	var DivContent;
	var year,month,day;
	var o=InputBox;
	var oid=o.id;
	var thisyear; 
	if(!oid)oid=o.name;
	thisyear=new getToday();
	thisyear=thisyear.year;
	today = o.value;
	if(isDate(today))today = new getStringDay(today);
	else today = new getToday(); 
	x=o.offsetLeft;
	y=o.offsetTop;
	while(o=o.offsetParent){
		x+=o.offsetLeft;
		y+=o.offsetTop;
	}
	document.all.Calendar.style.left=0;
	document.all.Calendar.style.top=0;
	document.all.Calendar.style.visibility="visible";
	DivContent="<table border='0' cellspacing='0' style='border:1px solid #0066FF; background-color:#EDF2FC'>";
	DivContent+="<tr>";
	DivContent+="<td style='border-bottom:1px solid #0066FF; background-color:#C7D8FA'>";
	DivContent+="<select name='Year' id='Year' onChange='newCalendar()' style='font-family:Verdana; font-size:12px'>";
	for (intLoop = thisyear - 100; intLoop < (thisyear + 2); intLoop++) DivContent+="<option value= " + intLoop + " " + (today.year == intLoop ? "Selected" : "") + ">" + intLoop + "</option>"; 
	DivContent+="</select>";
	DivContent+="<select name='Month' id='Month' onChange='newCalendar()' style='font-family:Verdana; font-size:12px'>";
	for (intLoop = 0; intLoop < months.length; intLoop++) DivContent+="<option value= " + (intLoop + 1) + " " + (today.month == intLoop ? "Selected" : "") + ">" + months[intLoop] + "</option>"; 
	DivContent+="</select>";
	DivContent+="</td>";
	DivContent+="<td style='border-bottom:1px solid #0066FF; background-color:#C7D8FA; font-weight:bold; font-family:Wingdings 2,Wingdings,Webdings; font-size:16px; padding-top:2px; color:#4477FF; cursor:hand' align='center' title='关闭' onClick='javascript:HiddenCalendar()'>S</td>";
	DivContent+="</tr>"; 
	DivContent+="<tr><td align='center' colspan='2'>";
	DivContent+="<table id='calendar' border='0' width='100%'>";
	DivContent+="<tr>";
	for (intLoop = 0; intLoop < days.length; intLoop++) DivContent+="<td align='center' style='font-size:12px'>" + days[intLoop] + "</td>"; 
	DivContent+="</tr>";
	for (intWeeks = 0; intWeeks < 6; intWeeks++){ 
		DivContent+="<tr>"; 
		for (intDays = 0; intDays < days.length; intDays++) DivContent+="<td onClick='GetDate(\"" + oid + "\")' style='cursor:hand; border-right:1px solid #BBBBBB; border-bottom:1px solid #BBBBBB; color:#215DC6; font-family:Verdana; font-size:12px' align='center'></td>"; 
		DivContent+="</tr>"; 
	} 
	DivContent+="</table></td></tr></table>";
	document.all.Calendar.innerHTML=DivContent;
	newCalendar();
}

function isDate(dateStr){ 
	var datePat = /^(\d{4})(\-)(\d{1,2})(\-)(\d{1,2})$/;
	var matchArray = dateStr.match(datePat);
	if (matchArray == null) return false; 
	var month = matchArray[3];
	var day = matchArray[5]; 
	var year = matchArray[1]; 
	if (month < 1 || month > 12) return false; 
	if (day < 1 || day > 31) return false; 
	if ((month==4 || month==6 || month==9 || month==11) && day==31) return false; 
	if (month == 2){
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); 
		if (day > 29 || (day==29 && !isleap)) return false; 
	} 
	return true;
}