function c$(sId) {
    if (sId == "") return null;
    return document.getElementById(sId);
}
function cnCalendar() {
    var _calendar_obj = null;
    var outfunc = null;
    var reciever;
    var curDate = null;
    var startDate = null;
    var endDate = null;
	
	
	var today = new Date();
	var y = today.getFullYear();
	var m = today.getMonth() + 1;
	this.daysInMonth = function(y, m)
	{
		switch (m)
		{
			case 1:
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
				return 31;
			case 4:
			case 6:
			case 9:
			case 11:
				return 30;
			case 2:
				if (y % 4 != 0)
				{
					return 28;
				}
				if (y % 100 == 0)
				{
					return y % 400 == 0 ? 29 : 28;
				}
				return 29;
		}
	}
	//Generate Codes
	this.generateCalendarTable = function() {
	    var gy, gm, gd;
	    if (reciever.value) {
	        var sDate = new Date(Date.parse(reciever.value.replace(/-/g, "/")));
	        gy = sDate.getFullYear();
	        gm = sDate.getMonth() + 1;
	        gd = sDate.getDate();
	    }
	    var i;
	    var j = new Date(y, m - 1, 1).getDay();
	    var k = this.daysInMonth(y, m);
	    var body = '';
	    //Frame Table Header
	    body += "<table class='calendar_table' cellpadding='0' cellspacing='1' author=\"outclick\">";
	    body += "	<tr>";
	    body += "		<td colspan='7' style='padding-bottom:0px' author=\"outclick\">";
	    body += "			<table class='calendar_caption' author=\"outclick\">";
	    body += "				<tr>";
	    body += "					<td author=\"outclick\"><a href='javascript:calendar.loadPreviousYear()' class=\"calendar_nav navleft2\" author=\"outclick\"></a><a href='javascript:calendar.loadPreviousMonth()' class=\"calendar_nav navleft\" author=\"outclick\"></a></td>";
	    body += "					<td author=\"outclick\" align='center' nowrap='nowrap' ><span id=\"spanCYear\" onclick=\"calendar.changeYearMonth(this,'year')\" author=\"outclick\" date=\"year\">" + y + "年</span><span date=\"year\" author=\"outclick\" id=\"changeCYear\" style=\"display:none;\"></span><span id=\"changeCMonth\" date=\"year\" author=\"outclick\" style=\"display:none;\"></span><span id=\"spanCMonth\" onclick=\"calendar.changeYearMonth(this,'month')\" date=\"year\" author=\"outclick\">" + m + "月</span></td>";
	    body += "					<td author=\"outclick\"><a author=\"outclick\" class=\"calendar_nav navright\" href='javascript:calendar.loadNextMonth()'></a><a author=\"outclick\" class=\"calendar_nav navright2\" href='javascript:calendar.loadNextYear()'></a></td>";
	    body += "				</tr>";
	    body += "			</table>";
	    body += "		</td>";
	    body += "	</tr>";
	    //Calendar Table Header
	    body += "	<tr class='calendar_header' >";
	    body += "		<td author=\"outclick\">日</td>";
	    body += "		<td author=\"outclick\">一</td>";
	    body += "		<td author=\"outclick\">二</td>";
	    body += "		<td author=\"outclick\">三</td>";
	    body += "		<td author=\"outclick\">四</td>";
	    body += "		<td author=\"outclick\">五</td>";
	    body += "		<td author=\"outclick\">六</td>";
	    body += "	</tr>";
	    if (j != 0) {
	        body += "<tr align='center'>";
	        body += ("<td author=\"outclick\" colspan='" + j + "'></td>");
	    }
	    for (i = 1; i <= k; i++) {
	        if ((i + j) % 7 == 1) {
	            body += "<tr align='center'>";
	        }
	        body += "<td author=\"outclick\"";
	        if (this.disabledDate(y, m, i)) {
	            body += " class=\"calendar_day disabled_css\" ";
	        } else {
	            if (y == today.getFullYear() && m == today.getMonth() + 1 && i == today.getDate()) {//等于当天
	                body += " class=\"calendar_day today_css\" ";
	            }
	            else if ((y + "-" + m + "-" + i) == (gy + "-" + gm + "-" + gd)) {//选中的时间
	                body += " class=\"calendar_day currentday_css\" ";
	            }
	            else {
	                body += " class=\"calendar_day out_css\" ";
	            }
	            body += " onmouseover=\"if(this.className=='calendar_day out_css' )this.className='calendar_day over_css';\"";
	            body += " onmouseout=\"if(this.className=='calendar_day over_css'){this.className='calendar_day out_css'}\"";
	            body += " onclick=\"calendar.setValue('" + y + "-" + this.getZeroNum(m) + "-" + this.getZeroNum(i) + "')\"";
	        }
	        body += ">" + i + "</td>";
	        if ((i + j) % 7 == 0) {
	            body += ("</tr>");
	        }
	    }
	    if ((i + j) % 7 != 0) {
	        body += ("<td author=\"outclick\" colspan='" + (8 - (i + j) % 7) + "'></td>");
	        body += ("</tr>");
	    }
	    if (j < (36 - k)) {
	        body += ("<tr><td author=\"outclick\" colspan='7' >&nbsp;</td></tr>");
	    }
	    if (j == 0 && k == 28) {
	        body += ("<tr><td author=\"outclick\" colspan='7' >&nbsp;</td></tr>");
	    }
	    body += "<tr><td colspan='7' author=\"outclick\"  style='text-align:center;height:20px;padding:2 0 2 0'><a class=\"calendar_button\" href=\"javascript:calendar.toDay()\">今天</a>&nbsp;&nbsp;<a class=\"calendar_button\" href=\"javascript:calendar.setValue('')\">清空</a></td></tr>"
	    body += "</table>";
	    return body;
	}
	this.loadPreviousYear = function()
	{
	    y--;
		_calendar_obj.innerHTML = this.generateCalendarTable();
	}
	this.loadNextYear = function()
	{
	    y++;
		_calendar_obj.innerHTML = this.generateCalendarTable();
	}
	this.loadPreviousMonth = function()
	{
		m--;
		if (m < 1){m = 12;y--;}
		_calendar_obj.innerHTML = this.generateCalendarTable();
	}
	this.loadNextMonth = function()
	{
		m++;
		if (m > 12)
		{
			m = 1;
			y++;
		}
		_calendar_obj.innerHTML = this.generateCalendarTable();
	}
	this.changeYear = function(year) {
	    y = parseInt(year.replace("年", ""));
	    _calendar_obj.innerHTML = this.generateCalendarTable();
	}
	this.changeMonth = function(month) {
	    m = parseInt(month.replace("月", ""));
	    _calendar_obj.innerHTML = this.generateCalendarTable();
	}
	this.getAbsolutePosition = function(element)
	{
		var point = { x: element.offsetLeft, y: element.offsetTop };
		if (element.offsetParent)
		{
			var parentPoint = this.getAbsolutePosition(element.offsetParent);
			point.x += parentPoint.x;
			point.y += parentPoint.y;
		}
		return point;
    };


    this.initValue = function(isCur, start, end) {
        curDate = null;
        startDate = null;
        endDate = null;
        if (isCur) curDate = new Date();
        if (start != "" && $(start) && c$(start).value != "") startDate = new Date(Date.parse(c$(start).value.replace(/-/g, "/")));
        if (end != "" && $(end) && c$(end).value != "") endDate = new Date(Date.parse(c$(end).value.replace(/-/g, "/")));
    }

     this.disabledDate = function(my, mm, md) {
         var sTime = new Date(my, mm - 1, md);
         var bl = false;
         if (curDate != null && sTime < curDate) return true;
         if (startDate != null && sTime < startDate) return  true;
         if (endDate != null && sTime > endDate) return true;
         return bl;
     }

     this.setHook = function (obj, isCur, start, end, func) {
         var dateField = obj.previousSibling;
         if (dateField.disabled) return;
         reciever = dateField;
         if (func) outfunc = func;
         this.initValue(isCur, start, end);
         _calendar_obj = c$("calendar_div")
         if (!_calendar_obj) {
             var divObj = document.createElement("div");
             divObj.id = "calendar_div";
             divObj.style.position = "absolute";
             divObj.style.styleFloat = "left";
             divObj.style.display = "none";
             divObj.style.zIndex = "999999";
             document.body.appendChild(divObj);
             _calendar_obj = divObj;
         }
         //没有隐藏则隐藏
         if (_calendar_obj.style.display != 'none' && reciever == dateField) {
             _calendar_obj.style.display = 'none';
             return;
         }
         //定位
         var point = this.getAbsolutePosition(dateField);
         var cw = 192;
         var allw = document.body.offsetWidth;
         var lx = point.x + dateField.offsetWidth;
         if (lx + cw > allw) {
             lx = lx - cw;
         }
         _calendar_obj.style.left = lx + 'px';
         _calendar_obj.style.top = point.y + 10 + 'px';
         //有值
         if (reciever.value) {
             var tmpDate = new Date(Date.parse(reciever.value.replace(/-/g, "/")));
             y = tmpDate.getFullYear();
             m = tmpDate.getMonth() + 1;
         }
         _calendar_obj.innerHTML = this.generateCalendarTable();
         _calendar_obj.style.display = "";
     }
     this.fadeOut = function () {
         if (_calendar_obj) {
             _calendar_obj.style.display = 'none';
         }
     }
    this.toDay = function() {
        var date = GetCurDate();
        reciever.value = date.getFullYear() + "-" + this.getZeroNum(date.getMonth() + 1) + "-" + this.getZeroNum(date.getDate());
        if (outfunc)eval(outfunc);
        this.fadeOut();
    }
	this.setValue = function(date) {
	    reciever.value = date;
	    if (outfunc) eval(outfunc);
	    this.fadeOut();
	}
	this.getZeroNum = function(mon) {
	    if (mon < 10) return  "0"+mon;
	    else return mon;
	}
	this.changeYearMonth = function(obj, sType) {
	    obj.style.display = "none";
	    var str = obj.innerHTML;
	    if (sType == "year") {
	        c$("changeCMonth").style.display = "none";
	        c$("changeCYear").style.display = "";
	        c$("spanCMonth").style.display = "";
	        if (c$("changeCYear").innerHTML == "") {
	            var yearObj = document.createElement("select");
	            yearObj.setAttribute("author", "outclick");
	            yearObj.setAttribute("date", "year");
	            if (yearObj.addEventListener) {
	                yearObj.addEventListener("change", function(e) { changeValueCalendar(this, "year") }, false);
	            } else {
	                yearObj.attachEvent("onchange", function(e) { changeValueCalendar(yearObj, "year") }, false);
	            }
	            var i = 0;
	            for (yNum = 1949; yNum <= 2050; yNum++) {
	                var opt = new Option(yNum + "年", yNum + "年");
	                opt.setAttribute("author", "outclick");
	                opt.setAttribute("date", "month");
	                yearObj.options.add(opt);
	                if (str.indexOf(yNum) != -1)
	                    yearObj.selectedIndex = i;
	                i++;
	            }
	            c$("changeCYear").appendChild(yearObj);
	        }
	        else {
	            var ci = 0;
	            for (var yNum = 1949; yNum <= 2050; yNum++) {
	                if (str.indexOf(yNum) != -1) {
	                    c$("changeCYear").childNodes[0].selectedIndex = ci;
	                    break;
	                }
	                ci++;
	            }
	        }
	    } else {
	        c$("changeCYear").style.display = "none";
	        c$("changeCMonth").style.display = "";
	        c$("spanCYear").style.display = "";
	        if (c$("changeCMonth").innerHTML == "") {
	            var monthObj = document.createElement("select");
	            monthObj.setAttribute("author", "outclick");
	            monthObj.setAttribute("date", "month");
	            if (monthObj.addEventListener) {
	                monthObj.addEventListener("change", function() { changeValueCalendar(this, "month") }, false);
	            } else {
	                monthObj.attachEvent("onchange", function() { changeValueCalendar(monthObj, "month") }, false);
	            }
	            for (var mNum = 1; mNum <= 12; mNum++) {
	                var mopt = new Option(mNum + "月", mNum + "月");
	                mopt.setAttribute("author", "outclick");
	                mopt.setAttribute("date", "month");
	                monthObj.options.add(mopt);
	                if (str.indexOf(mNum + "月") != -1) {
	                    monthObj.selectedIndex = mNum - 1;
	                }
	            }
	            c$("changeCMonth").appendChild(monthObj);
	        }
	        else {
	            for (var cmNum = 1; cmNum <= 12; cmNum++) {
	                if (str.indexOf(cmNum + '月') != -1)
	                    monthObj.selectedIndex = cmNum;
	            }
	        }
	    }
	}
}
function changeValueCalendar(obj, sType) {
    if(sType=="year"){
        c$("spanCYear").innerHTML=obj.value;
        c$("spanCYear").style.display = "";
        c$("changeCYear").style.display = "none";
        calendar.changeYear(obj.value);
    } else {
        c$("spanCMonth").innerHTML=obj.value;
        c$("spanCMonth").style.display = "";
        c$("changeCMonth").style.display = "none";
        calendar.changeMonth(obj.value);
    }
}
function hideCalendar(event) {
    event = (event == null) ? window.event : event;
    var srcelement = event.target ? event.target : event.srcElement;
    if (srcelement.getAttribute("author") != null && srcelement.getAttribute("date")==null) {
        if (c$("changeCYear").style.display == "") {
            c$("spanCYear").style.display = "";
            c$("changeCYear").style.display = "none";
        }
        
        if (c$("changeCMonth").style.display == "") {
            c$("spanCMonth").style.display = "";
            c$("changeCMonth").style.display = "none";
        }
    }else {
    if (srcelement.getAttribute("author") == null && srcelement.className.indexOf("shortbtn") == -1) {
            calendar.fadeOut();
        }
    }
}
var calendar = new cnCalendar();
window.onload = function() {
    if (document.addEventListener) {
        document.addEventListener("click", function(e) { hideCalendar(e) }, false);
    } else {
        document.attachEvent("onclick", function(e) { hideCalendar(e) }, false);
    }
}