var cal;
 var isFocus=false; //是否为焦点
 
 //选择日期 
 function SelectDate(obj,strFormat)
  {
     var date = new Date();
     var by = date.getFullYear()-50;  //最小值 → 50 年前
     var ey = date.getFullYear()+50;  //最大值 → 50 年后
     //cal = new Calendar(by, ey,1,strFormat);    //初始化英文版，0 为中文版
     cal = (cal==null) ? new Calendar(by, ey, 1) : cal;    //不用每次都初始化 2006-12-03 修正
     cal.dateFormatStyle = strFormat;
     cal.show(obj);
 }
  /**//**
  * 返回日期
  * @param d the delimiter
  * @param p the pattern of your date
  */
 //String.prototype.toDate = function(x, p) {
  String.prototype.toDate = function(style) {
  /**//*
   if(x == null) x = "-";
   if(p == null) p = "ymd";
   var a = this.split(x);
   var y = parseInt(a[p.indexOf("y")]);
   //remember to change this next century ;)
   if(y.toString().length <= 2) y += 2000;
   if(isNaN(y)) y = new Date().getFullYear();
   var m = parseInt(a[p.indexOf("m")]) - 1;
   var d = parseInt(a[p.indexOf("d")]);
   if(isNaN(d)) d = 1;
   return new Date(y, m, d);
   */
   var y = this.substring(style.indexOf('y'),style.lastIndexOf('y')+1);//年
   var m = this.substring(style.indexOf('M'),style.lastIndexOf('M')+1);//月
   var d = this.substring(style.indexOf('d'),style.lastIndexOf('d')+1);//日
   if(isNaN(y)) y = new Date().getFullYear();
   if(isNaN(m)) m = new Date().getMonth();
   if(isNaN(d)) d = new Date().getDate();
   var dt ;
   eval ("dt = new Date('"+ y+"', '"+(m-1)+"','"+ d +"')");
   return dt;
 }
 
  /**//**
  * 格式化日期
  * @param   d the delimiter
  * @param   p the pattern of your date
  * @author  meizz
  */
  Date.prototype.format = function(style) {
    var o = {
     "M+" : this.getMonth() + 1, //month
     "d+" : this.getDate(),      //day
     "h+" : this.getHours(),     //hour
     "m+" : this.getMinutes(),   //minute
     "s+" : this.getSeconds(),   //second
     "w+" : "天一二三四五六".charAt(this.getDay()),   //week
     "q+" : Math.floor((this.getMonth() + 3) / 3),  //quarter
     "S"  : this.getMilliseconds() //millisecond
   }
    if(/(y+)/.test(style)) {
     style = style.replace(RegExp.$1,
     (this.getFullYear() + "").substr(4 - RegExp.$1.length));
   }
    for(var k in o){
      if(new RegExp("("+ k +")").test(style)){
       style = style.replace(RegExp.$1,
         RegExp.$1.length == 1 ? o[k] :
         ("00" + o[k]).substr(("" + o[k]).length));
     }
   }
   return style;
 };
 
  /**//**
  * 日历类
  * @param   beginYear 1990
  * @param   endYear   2010
  * @param   lang      0(中文)|1(英语) 可自由扩充
  * @param   dateFormatStyle  "yyyy-MM-dd";
  * @version 2006-04-01
  * @update
  */
  function Calendar(beginYear, endYear, lang, dateFormatStyle) {
   this.beginYear = 1990;
   this.endYear = 2010;
   this.lang = 0;            //0(中文) | 1(英文)
   this.dateFormatStyle = "yyyy-MM-dd";
 
    if (beginYear != null && endYear != null){
     this.beginYear = beginYear;
     this.endYear = endYear;
   }
    if (lang != null){
     this.lang = lang
   }
 
    if (dateFormatStyle != null){
     this.dateFormatStyle = dateFormatStyle
   }
 
   this.dateControl = null;
   this.panel = this.getElementById("calendarPanel");
   this.container = this.getElementById("ContainerPanel");
   this.form  = null;
 
   this.date = new Date();
   this.year = this.date.getFullYear();
   this.month = this.date.getMonth();
 
 
    this.colors = {
   "cur_word"      : "#FFFFFF",  //当日日期文字颜色
   "cur_bg"        : "#00FF00",  //当日日期单元格背影色
   "sel_bg"        : "#FFCCCC",  //已被选择的日期单元格背影色 
   "sun_word"      : "#FF0000",  //星期天文字颜色
   "sat_word"      : "#0000FF",  //星期六文字颜色
   "td_word_light" : "#333333",  //单元格文字颜色
   "td_word_dark"  : "#CCCCCC",  //单元格文字暗色
   "td_bg_out"     : "#EFEFEF",  //单元格背影色
   "td_bg_over"    : "#FFCC00",  //单元格背影色
   "tr_word"       : "#FFFFFF",  //日历头文字颜色
   "tr_bg"         : "#666666",  //日历头背影色
   "input_border"  : "#CCCCCC",  //input控件的边框颜色
   "input_bg"      : "#EFEFEF"   //input控件的背影色
   }
 
   this.draw();
   this.bindYear();
   this.bindMonth();
   this.changeSelect();
   this.bindData();
 }
 
  /**//**
  * 日历类属性（语言包，可自由扩展）
  */
  Calendar.language = {
   "year"   : [[""], [""]],
   "months" : [["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"],
         ["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"]
          ],
   "weeks"  : [["SUN","MON","TUR","WED","THU","FRI","SAT"],
         ["日","一","二","三","四","五","六"]
          ],
   "clear"  : [["CLS"], ["清空"]],
   "today"  : [["TODAY"], ["今天"]],
   "close"  : [["CLOSE"], ["关闭"]]
 }
 
  Calendar.prototype.draw = function() {
   calendar = this;
 
   var mvAry = [];
   //mvAry[mvAry.length]  = '  <form name="calendarForm" style="margin: 0px;">'; 
   mvAry[mvAry.length]  = '  <div name="calendarForm" style="margin: 0px;">';
   mvAry[mvAry.length]  = '    <table width="100%" border="0" cellpadding="0" cellspacing="1">';
   mvAry[mvAry.length]  = '      <tr>';
   mvAry[mvAry.length]  = '        <th align="left" width="1%"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:20px;" name="prevMonth" type="button" id="prevMonth" value="&lt;" /></th>';
   mvAry[mvAry.length]  = '        <th align="center" width="98%" nowrap="nowrap"><select name="calendarYear" id="calendarYear" style="font-size:12px;"></select><select name="calendarMonth" id="calendarMonth" style="font-size:12px;"></select></th>';
   mvAry[mvAry.length]  = '        <th align="right" width="1%"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:20px;" name="nextMonth" type="button" id="nextMonth" value="&gt;" /></th>';
   mvAry[mvAry.length]  = '      </tr>';
   mvAry[mvAry.length]  = '    </table>';
   mvAry[mvAry.length]  = '    <table id="calendarTable" width="100%" style="border:0px solid #CCCCCC;background-color:#FFFFFF" border="0" cellpadding="3" cellspacing="1">';
   mvAry[mvAry.length]  = '      <tr>';
    for(var i = 0; i < 7; i++) {
     mvAry[mvAry.length]  = '      <th style="font-weight:normal;background-color:' + calendar.colors["tr_bg"] + ';color:' + calendar.colors["tr_word"] + ';">' + Calendar.language["weeks"][this.lang][i] + '</th>';
   }
   mvAry[mvAry.length]  = '      </tr>';
    for(var i = 0; i < 6;i++){
     mvAry[mvAry.length]  = '    <tr align="center">';
      for(var j = 0; j < 7; j++) {
        if (j == 0){
         mvAry[mvAry.length]  = '  <td style="cursor:default;color:' + calendar.colors["sun_word"] + ';"></td>';
        } else if(j == 6) {
         mvAry[mvAry.length]  = '  <td style="cursor:default;color:' + calendar.colors["sat_word"] + ';"></td>';
        } else {
         mvAry[mvAry.length]  = '  <td style="cursor:default;"></td>';
       }
     }
     mvAry[mvAry.length]  = '    </tr>';
   }
   mvAry[mvAry.length]  = '      <tr style="background-color:' + calendar.colors["input_bg"] + ';">';
   mvAry[mvAry.length]  = '        <th colspan="2"><input name="calendarClear" type="button" id="calendarClear" value="' + Calendar.language["clear"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
   mvAry[mvAry.length]  = '        <th colspan="3"><input name="calendarToday" type="button" id="calendarToday" value="' + Calendar.language["today"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
   mvAry[mvAry.length]  = '        <th colspan="2"><input name="calendarClose" type="button" id="calendarClose" value="' + Calendar.language["close"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
   mvAry[mvAry.length]  = '      </tr>';
   mvAry[mvAry.length]  = '    </table>';
   //mvAry[mvAry.length]  = '  </from>';
   mvAry[mvAry.length]  = '  </div>';
   this.panel.innerHTML = mvAry.join("");
   
   var obj = this.getElementById("prevMonth");
    obj.onclick = function () {calendar.goPrevMonth(calendar);}
    obj.onblur = function () {calendar.onblur();}
   this.prevMonth= obj;
   
   obj = this.getElementById("nextMonth");
    obj.onclick = function () {calendar.goNextMonth(calendar);}
    obj.onblur = function () {calendar.onblur();}
   this.nextMonth= obj;
   
   
 
   obj = this.getElementById("calendarClear");
    obj.onclick = function () {calendar.dateControl.value = "";calendar.hide();}
   this.calendarClear = obj;
   
   obj = this.getElementById("calendarClose");
    obj.onclick = function () {calendar.hide();}
   this.calendarClose = obj;
   
   obj = this.getElementById("calendarYear");
    obj.onchange = function () {calendar.update(calendar);}
    obj.onblur = function () {calendar.onblur();}
   this.calendarYear = obj;
   
   obj = this.getElementById("calendarMonth");
   with(obj)
    {
      onchange = function () {calendar.update(calendar);}
      onblur = function () {calendar.onblur();}
   }this.calendarMonth = obj;
  
   obj = this.getElementById("calendarToday");
    obj.onclick = function () {
     var today = new Date();
     calendar.date = today;
     calendar.year = today.getFullYear();
     calendar.month = today.getMonth();
     calendar.changeSelect();
     calendar.bindData();
     calendar.dateControl.value = today.format(calendar.dateFormatStyle);
     calendar.hide();
   }
   this.calendarToday = obj;
 
    /*
   //this.form = document.forms["calendarForm"];   
   this.form.prevMonth.onclick = function () {calendar.goPrevMonth(this);}
   this.form.nextMonth.onclick = function () {calendar.goNextMonth(this);}
   
   this.form.prevMonth.onblur = function () {calendar.onblur();}
   this.form.nextMonth.onblur = function () {calendar.onblur();}
 
   this.form.calendarClear.onclick = function () {calendar.dateControl.value = "";calendar.hide();}
   this.form.calendarClose.onclick = function () {calendar.hide();}
   this.form.calendarYear.onchange = function () {calendar.update(this);}
   this.form.calendarMonth.onchange = function () {calendar.update(this);}
   
   this.form.calendarYear.onblur = function () {calendar.onblur();}
   this.form.calendarMonth.onblur = function () {calendar.onblur();}
   
   this.form.calendarToday.onclick = function () {
     var today = new Date();
     calendar.date = today;
     calendar.year = today.getFullYear();
     calendar.month = today.getMonth();
     calendar.changeSelect();
     calendar.bindData();
     calendar.dateControl.value = today.format(calendar.dateFormatStyle);
     calendar.hide();
   }
 */
 }
 
 //年份下拉框绑定数据
  Calendar.prototype.bindYear = function() {
   //var cy = this.form.calendarYear;
   var cy = this.calendarYear;
   cy.length = 0;
    for (var i = this.beginYear; i <= this.endYear; i++){
     cy.options[cy.length] = new Option(i + Calendar.language["year"][this.lang], i);
   }
 }
 
 //月份下拉框绑定数据
  Calendar.prototype.bindMonth = function() {
   //var cm = this.form.calendarMonth;
   var cm = this.calendarMonth;
   cm.length = 0;
    for (var i = 0; i < 12; i++){
     cm.options[cm.length] = new Option(Calendar.language["months"][this.lang][i], i);
   }
 }
 
 //向前一月
  Calendar.prototype.goPrevMonth = function(e){
    if (this.year == this.beginYear && this.month == 0){return;}
   this.month--;
    if (this.month == -1) {
     this.year--;
     this.month = 11;
   }
   this.date = new Date(this.year, this.month, 1);
   this.changeSelect();
   this.bindData();
 }
 
 //向后一月
  Calendar.prototype.goNextMonth = function(e){
    if (this.year == this.endYear && this.month == 11){return;}
   this.month++;
    if (this.month == 12) {
     this.year++;
     this.month = 0;
   }
   this.date = new Date(this.year, this.month, 1);
   this.changeSelect();
   this.bindData();
 }
 
 //改变SELECT选中状态
  Calendar.prototype.changeSelect = function() {
   //var cy = this.form.calendarYear;
   //var cm = this.form.calendarMonth;
   var cy = this.calendarYear;
   var cm = this.calendarMonth;
    for (var i= 0; i < cy.length; i++){
      if (cy.options[i].value == this.date.getFullYear()){
       cy[i].selected = true;
       break;
     }
   }
    for (var i= 0; i < cm.length; i++){
      if (cm.options[i].value == this.date.getMonth()){
       cm[i].selected = true;
       break;
     }
   }
 }
 
 //更新年、月
  Calendar.prototype.update = function (e){
   //this.year  = e.form.calendarYear.options[e.form.calendarYear.selectedIndex].value;
   //this.month = e.form.calendarMonth.options[e.form.calendarMonth.selectedIndex].value;
   this.year  = e.calendarYear.options[e.calendarYear.selectedIndex].value;
   this.month = e.calendarMonth.options[e.calendarMonth.selectedIndex].value;
   this.date = new Date(this.year, this.month, 1);
   this.changeSelect();
   this.bindData();
 }
 
 //绑定数据到月视图
  Calendar.prototype.bindData = function () {
   var calendar = this;
   var dateArray = this.getMonthViewArray(this.date.getYear(), this.date.getMonth());
   var tds = this.getElementById("calendarTable").getElementsByTagName("td");
    for(var i = 0; i < tds.length; i++) {
   //tds[i].style.color = calendar.colors["td_word_light"];
   tds[i].style.backgroundColor = calendar.colors["td_bg_out"];
      tds[i].onclick = function () {return;}
      tds[i].onmouseover = function () {return;}
      tds[i].onmouseout = function () {return;}
     if (i > dateArray.length - 1) break;
     tds[i].innerHTML = dateArray[i];
      if (dateArray[i] != "&nbsp;"){
        tds[i].onclick = function () {
          if (calendar.dateControl != null){
           calendar.dateControl.value = new Date(calendar.date.getFullYear(),
                                                 calendar.date.getMonth(),
                                                 this.innerHTML).format(calendar.dateFormatStyle);
         }
         calendar.hide();
       }
        tds[i].onmouseover = function () {
         this.style.backgroundColor = calendar.colors["td_bg_over"];
       }
        tds[i].onmouseout = function () {
         this.style.backgroundColor = calendar.colors["td_bg_out"];
       }
       if (new Date().format(calendar.dateFormatStyle) ==
           new Date(calendar.date.getFullYear(),
                    calendar.date.getMonth(),
                     dateArray[i]).format(calendar.dateFormatStyle)) {
         //tds[i].style.color = calendar.colors["cur_word"];
         tds[i].style.backgroundColor = calendar.colors["cur_bg"];
          tds[i].onmouseover = function () {
           this.style.backgroundColor = calendar.colors["td_bg_over"];
         }
          tds[i].onmouseout = function () {
           this.style.backgroundColor = calendar.colors["cur_bg"];
         }
         //continue; //若不想当天单元格的背景被下面的覆盖，请取消注释
       }//end if
       
       //设置已被选择的日期单元格背影色 
       if (calendar.dateControl != null && calendar.dateControl.value == new Date(calendar.date.getFullYear(),
                    calendar.date.getMonth(),
                     dateArray[i]).format(calendar.dateFormatStyle)) {
         tds[i].style.backgroundColor = calendar.colors["sel_bg"];
          tds[i].onmouseover = function () {
           this.style.backgroundColor = calendar.colors["td_bg_over"];
         }
          tds[i].onmouseout = function () {
           this.style.backgroundColor = calendar.colors["sel_bg"];
         }
       }
     }
   }
 }
 
 //根据年、月得到月视图数据(数组形式)
  Calendar.prototype.getMonthViewArray = function (y, m) {
   var mvArray = [];
   var dayOfFirstDay = new Date(y, m, 1).getDay();
   var daysOfMonth = new Date(y, m + 1, 0).getDate();
    for (var i = 0; i < 42; i++) {
     mvArray[i] = "&nbsp;";
   }
    for (var i = 0; i < daysOfMonth; i++){
     mvArray[i + dayOfFirstDay] = i + 1;
   }
   return mvArray;
 }
 
 //扩展 document.getElementById(id) 多浏览器兼容性 from meizz tree source
  Calendar.prototype.getElementById = function(id){
   if (typeof(id) != "string" || id == "") return null;
   if (document.getElementById) return document.getElementById(id);
   if (document.all) return document.all(id);
    try {return eval(id);} catch(e){ return null;}
 }
 
 //扩展 object.getElementsByTagName(tagName)
  Calendar.prototype.getElementsByTagName = function(object, tagName){
   if (document.getElementsByTagName) return document.getElementsByTagName(tagName);
   if (document.all) return document.all.tags(tagName);
 }
 
 //取得HTML控件绝对位置
  Calendar.prototype.getAbsPoint = function (e){
   var x = e.offsetLeft;
   var y = e.offsetTop;
    while(e = e.offsetParent){
     x += e.offsetLeft;
     y += e.offsetTop;
   }
    return {"x": x, "y": y};
 }
 
 //显示日历
  Calendar.prototype.show = function (dateObj, popControl) {
    if (dateObj == null){
     throw new Error("arguments[0] is necessary")
   }
   this.dateControl = dateObj;
   
   //if (dateObj.value.length > 0){
   //this.date = new Date(dateObj.value.toDate());
   //this.date = new Date(dateObj.value.toDate(this.dateFormatStyle));//带入用户指定的 style  
   this.date = (dateObj.value.length > 0) ? new Date(dateObj.value.toDate(this.dateFormatStyle)) : new Date() ;// 若为空则显示当前月份
   this.year = this.date.getFullYear();
   this.month = this.date.getMonth();
   this.changeSelect();
   this.bindData();
   //}
    if (popControl == null){
     popControl = dateObj;
   }
   var xy = this.getAbsPoint(popControl);
   this.panel.style.left = xy.x -25 + "px";
   this.panel.style.top = (xy.y + dateObj.offsetHeight) + "px";
   
   // 把 visibility 变为 display，并添加失去焦点的事件
   //this.setDisplayStyle("select", "hidden");
   //this.panel.style.visibility = "visible";
   //this.container.style.visibility = "visible";
   this.panel.style.display = "";
   this.container.style.display = "";
   
    dateObj.onblur = function(){calendar.onblur();}
    this.container.onmouseover = function(){isFocus=true;}
    this.container.onmouseout = function(){isFocus=false;}
 }
 
 //隐藏日历
  Calendar.prototype.hide = function() {
   //this.setDisplayStyle("select", "visible");
   //this.panel.style.visibility = "hidden";
   //this.container.style.visibility = "hidden";
   this.panel.style.display = "none";
   this.container.style.display = "none";
   isFocus=false;
 }
 
 //焦点转移时隐藏日历
  Calendar.prototype.onblur = function() {
      if(!isFocus){this.hide();}
 }
 

  /**//*
 //设置控件显示或隐藏
 Calendar.prototype.setDisplayStyle = function(tagName, style) {
   var tags = this.getElementsByTagName(null, tagName)
   for(var i = 0; i < tags.length; i++) {
     if (tagName.toLowerCase() == "select" &&
        (tags[i].name == "calendarYear" ||
       tags[i].name == "calendarMonth")){
       continue;
     }
     //tags[i].style.visibility = style;
     tags[i].style.display = style;
   }
 }
 */
 //document.write('<div id="ContainerPanel" style="visibility:hidden"><div id="calendarPanel" style="position: absolute;visibility: hidden;z-index: 9999;');
 document.write('<div id="ContainerPanel" style="display:none"><div id="calendarPanel" style="position: absolute;display: none;z-index: 9999;');
 document.write('background-color: #FFFFFF;border: 1px solid #CCCCCC;width:175px;font-size:12px;"></div>');
 if(document.all)
  {
 document.write('<iframe style="position:absolute;z-index:2000;width:expression(this.previousSibling.offsetWidth);');
 document.write('height:expression(this.previousSibling.offsetHeight);');
 document.write('left:expression(this.previousSibling.offsetLeft);top:expression(this.previousSibling.offsetTop);');
 document.write('display:expression(this.previousSibling.style.display);" scrolling="no" frameborder="no"></iframe>');
 }
 document.write('</div>');
 //var calendar = new Calendar();  
 //调用calendar.show(dateControl, popControl);