var nowDate    = new Date(); 
var class_uno;

function showCalendar(date,class_uno,class_id,textdate) { 

    var destDate    = getCalendarStringToDate(date); 
    getCalendarTags(destDate,class_uno,class_id,textdate); 
} 
function getCalendarStringToDate(strDate) { 

    var di    = new Array("-", ".", ","); 
    var returnDate  = new Date();
    var arrDate; 

    for(var i = 0 ; i < di.length; i++){ 
        arrDate = strDate.split(di[i]); 
        if(arrDate.length ==3){ 
            returnDate.setYear(arrDate[0]); 
            returnDate.setMonth(arrDate[1] - 1); 
            returnDate.setDate(arrDate[2]); 
            break; 
        } 
    } 

    if(!isNaN(strDate) && strDate.length ==8) { 
        returnDate.setYear(strDate.substring(0,4)); 
        returnDate.setMonth(strDate.substring(4,6) -1); 
        returnDate.setDate(strDate.substring(6)); 
    } 

    return returnDate; 
} 
function getCalendarFirstDateOfWeek(tDate) {
	
    var sunDay = new Date(); 
    var firstDateOfMonth    = new Date(); 
    firstDateOfMonth.setYear(tDate.getUTCFullYear()); 
    firstDateOfMonth.setMonth(tDate.getMonth()); 
    firstDateOfMonth.setDate(1); 
    sunDay.setTime(dayPlus(firstDateOfMonth, firstDateOfMonth.getDay() * -1)); 
    return sunDay; 
}  
function dayPlus(tDate,cnt) {    

    var rtnDate    = new Date(); 
    rtnDate.setTime(tDate.getTime() + ( cnt * 24 * 60 * 60 * 1000 ) ); 
    return rtnDate; 
}  
function getCalendarLastDate(tDate) { 

    rtnDate    = getMonthLastDay(tDate) 
    rtnDate    = dayPlus(rtnDate,6 - rtnDate.getDay()) 
    return rtnDate; 
}  
function getMonthLastDay(tDate) { 

    var Mon2 
    var rtnDate    = new Date(); 
    var arrLastDay = new Array(31,29,31,30,31,30,31,31,30,31,30,31); 
    if(tDate.getYear() % 4 ==0) Mon2 = true; 
    else Mon2 =false; 
    arrLastDay[1] = (Mon2) ? 29 : 28; 
    rtnDate.setYear(tDate.getUTCFullYear()); 
    rtnDate.setMonth(tDate.getMonth()); 
    rtnDate.setDate(arrLastDay[tDate.getMonth()]); 
    return rtnDate; 
}  
function getCalendarTags(destDate,class_uno,class_id,textdate) { 

    var arrLastDay = new Array(31,29,31,30,31,30,31,31,30,31,30,31);
    var strTag = ''; 
    var destYear	= destDate.getUTCFullYear(); 
    var destMonth	= destDate.getMonth() + 1; 
    var destDay		= destDate.getDate(); 

    var startDate	= getCalendarFirstDateOfWeek(destDate); 
    var endDate		= getCalendarLastDate(destDate); 
    
	var preYear	= destYear - 1;
    var preMonth	= destMonth - 1;	
    var nextYear	= destYear + 1;
    var nextMonth	= destMonth + 1;

	if(preMonth <10) {
		preMonth = "0" + preMonth;
	}
	if(nextMonth <10) {
		nextMonth = "0" + nextMonth;
	}
	if(destDay <10) {
		destDay = "0" + destDay;
	}

	var preYear_value = preYear + '-' + destMonth + '-' + destDay;
	if(destMonth == 1) {
		var preMonth_value = preYear + '-12' + '-' + destDay;
	} else {
		var preMonth_value = destYear + '-' + preMonth + '-' + destDay;		
	}
	var nextYear_value = nextYear + '-' + destMonth + '-' + destDay;
	if(destMonth == 12) {
		var nextMonth_value = nextYear + '-01' + '-' + destDay;
	} else {
		var nextMonth_value = destYear + '-' + nextMonth + '-' + destDay;		
	}	
	var pDate		= new Date(); 
    pDate			= startDate; 
    

    strTag = "<div class='monthBtnWrap'><span class='prevMonthBtn'><a href='classroom_main.php?class_uno=" + class_uno + "&class_id=" + class_id + "&date=" + preMonth_value + "'></a></span><span>" + destYear + "." + destMonth + "</span><span class='nextMonthBtn'><a href='classroom_main.php?class_uno=" + class_uno + "&class_id=" + class_id + "&date=" + nextMonth_value + "'></a></span></div>";
    strTag += "<div class='calendarTableWrap'>";
    strTag += "    <table border='0' cellspacing='1' cellpadding='0' class='calenderTable'>";
    strTag += "    <tr>";
    strTag += "        <th colspan='7'>";
    strTag += "        <table border='0' cellspacing='0' cellpadding='0' class='weekTable'>";
    strTag += "        <tr>";
    strTag += "            <td>ÀÏ</td>";
    strTag += "            <td>¿ù</td>";
    strTag += "            <td>È­</td>";
    strTag += "            <td>¼ö</td>";
    strTag += "            <td>¸ñ</td>";
    strTag += "            <td>±Ý</td>";
    strTag += "            <td>Åä</td>";
    strTag += "        </tr>";
    strTag += "        </table>";
    strTag += "        </th>";
    strTag += "    </tr>";

	s_num = 1;
    while(pDate <= endDate) { 

		y    = pDate.getFullYear(); 
        m    = pDate.getMonth() + 1; 
        d    = pDate.getDate(); 
        ed    = arrLastDay[nowDate.getMonth()]; 

		if(s_num < d || s_num > d) {
			date_title = '&nbsp;';
		} else {
			date_title = pDate.getDate();
			s_num ++;
		}

		if(m <10) {
			m = "0" + m;
		}
		if(d <10) {
			d = "0" + d;
		}
		d_value = y + '-' + m + '-' + d;

		if(pDate.getFullYear() == nowDate.getFullYear() && pDate.getDate() == nowDate.getDate() && pDate.getMonth() == nowDate.getMonth()) {
			var todayclass		= "today";
		} else if(pDate.getFullYear() == destDate.getFullYear() && pDate.getDate() == destDate.getDate() && pDate.getMonth() == destDate.getMonth()) {
			var todayclass		= "targetday";
		} else {
			var todayclass		= "";
			if(textdate[d_value] == 'Y') {
				todayclass		= "textday";
			}
		}

		switch(pDate.getDay()) {
			case 0: //ÀÏ¿äÀÏÀ̸é
                strTag	+=	"		<tr>";
                strTag	+=	"			<td class='sun'><a href='classroom_main.php?class_uno=" + class_uno + "&class_id=" + class_id + "&date=" + d_value + "' class='" + todayclass + "'>" + date_title + "</a></td>";
			break;
			case 6: //Åä¿äÀÏÀ̸é
                strTag	+=	"			<td class='sat'><a href='classroom_main.php?class_uno=" + class_uno + "&class_id=" + class_id + "&date=" + d_value + "' class='" + todayclass + "'>" + date_title + "</a></td>";
                strTag	+=	"		</tr>";
			break;
			default:
                strTag	+=	"			<td><a href='classroom_main.php?class_uno=" + class_uno + "&class_id=" + class_id + "&date=" + d_value + "' class='" + todayclass + "'>" + date_title + "</a></td>";
			break;
		}    
        pDate    = dayPlus(pDate, 1); //ÇÏ·ç ´õÇÑ´Ù 
    } 

    strTag += "    </table>";
    strTag += "</div>";

    document.write(strTag);  
}