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("星期日","星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
var getObject,oldObject;//取得當前對象
//取得指定年月的天數
function getDays(month, year) {
   if (1 == month)
      return ((0==year%4)&&(0!=(year%100)))||(0==year%400)?29:28;
   else
      return daysInMonth[month];
 }
//取得今天的年,月,日
function getToday() {
   this.now = new Date();
   this.year = this.now.getFullYear();
   this.month = this.now.getMonth();
   this.day = this.now.getDate();
}
today = new getToday();
//創建日歷
function newCalendar() { 
   today = new getToday();
   var parseYear = parseInt(document.all.year[document.all.year.selectedIndex].text);
   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.tBodies.dayList;
   var intDaysInMonth =getDays(newCal.getMonth(), newCal.getFullYear());
   for (var intWeek = 0; 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.className = "today";//今天的Class
			  else if(intDay==6)cell.className = "sunday";//周六的Class
			  else if (intDay==0)cell.className ="satday";//周日的Class
			  else cell.className="normal";//平常的Class
			  if ((daily > 0) && (daily <= intDaysInMonth)){ 
				   cell.innerText = daily;
				   daily++;
			  }else cell.innerText = "";
	   }
 }
//取得鼠標單擊處的日期數據
function getDate() {
   var sDate;
   if ("TD" == event.srcElement.tagName)
      if ("" != event.srcElement.innerText){//定義顯示日期的格式
		 sMonth = document.all.month.value;
		 sDay = event.srcElement.innerText;
		 if(sMonth.length==1)sMonth = "0"+sMonth;
		 if(sDay.length==1)sDay = "0"+sDay;
		 sDate = document.all.year.value + "-" + sMonth + "-" + sDay;
		 getObject.value=sDate;
		 window.close();
	  }
}
//隱藏圖層
function HideLayer() {
	Layer.style.visibility = "hidden";
}
//顯示圖層
function LayerShow(){
	Layer.style.visibility = "visible";
}
//顯示div對象Layer
function ShowLayer(t,l) {
	if(oldObject==null)oldObject=getObject;//賦值
	if(Layer.style.visibility != "visible" && oldObject==getObject){//判斷是否操作同一表
		Layer.style.top = t+document.body.scrollTop;
		Layer.style.left = l+document.body.scrollLeft;
		Layer.style.visibility = "visible";
		oldObject=getObject;
	}else if(oldObject==getObject){
		HideLayer();
	}else{
		Layer.style.top = t+document.body.scrollTop;
		Layer.style.left = l+document.body.scrollLeft;
		Layer.style.visibility = "visible";
		oldObject=getObject;
	}
}
//定義div對象Layer用以顯示日期
function getLayer(){
	document.write("<div id=\"Layer\" style=\"position:absolute;width:340;z-index:12;boder-color:#ffffff;border:0px outset white;background-color:#D4D0C8;layer-background-color:#D4D0C8;visibility:hidden;height:38;left:58;top:137;\"><input type=\"hidden\" name=\"ret\"><table width='320' id=\"calendar\" cellpadding=\"0\" align=\"center\"><thead><tr><td height='4'></td></tr><tr><td colspan=7 align=CENTER>請選擇月份：<select id=\"month\" onChange=\"newCalendar()\" name=\"select\" class=\"smallSel\">");
	for (var intLoop = 0; intLoop < months.length;  intLoop++)
	document.write("<OPTION VALUE= " + (intLoop + 1) + " " + (today.month == intLoop ? "Selected" : "") + ">" + months[intLoop]);
	document.write("</select> &nbsp;&nbsp;&nbsp;&nbsp;請選擇年份：<select id=\"year\" onChange=\"newCalendar()\" name=\"select\" class=\"smallSel\">");
	for (var intLoop = today.year-50; intLoop < (today.year + 10); intLoop++)
	document.write("<OPTION VALUE= "+intLoop+" "+(today.year == intLoop ?  "Selected" : "") + ">" + intLoop);
	document.write("</select></td></tr><tr><td height='6'></td></tr><tr class=\"days\">");
	document.write("<TD class=sunday>" + days[0] + "</TD>");
	for (var intLoop = 1; intLoop < days.length-1;intLoop++)
	document.write("<TD>" + days[intLoop] + "</TD>");
	document.write("<TD class=sunday>" + days[intLoop] + "</TD>");
	document.write(" </tr></thead><tbody border=1 cellspacing=\"0\" cellpadding=\"0\" id=\"dayList\" align=CENTER ONCLICK='getDate()'>");
	for (var intWeeks = 0; intWeeks < 6; intWeeks++){
		document.write("<TR style='cursor:hand'>");
		for (var intDays = 0; intDays < days.length;intDays++)document.write("<TD></TD>");
		document.write("</TR>");
	 }
	document.write("</tbody></table></div>");
}
//定義css
document.write("<style>TABLE{font-family:宋體,SimSun; font-size:9pt;border:0px;bgcolor:#D4D0C8;}.drpdwn	{font-family:宋體,SimSun;font-size:9pt;color:#000000;background-color:#000000} SELECT.smallSel{    BACKGROUND-COLOR: #eeeeee;    COLOR: #000000;    FONT-SIZE: 9pt} .normal{BACKGROUND: #D4D0C8;} .today {font-weight:bold;background-image:  url(./images/date.gif);} .satday{color:#800000} .sunday{color:#800000} .days {FONT-SIZE: 9pt;} .Arraw {color:#0000BB; cursor:hand; font-family:Webdings; font-size:9pt}</style>");

getLayer();//顯示日期選擇器

//選擇日期
function selectDate(x){
	getObject=x;
	newCalendar();
	ShowLayer(0,0);//顯示出div
}