// Calendar Display
var day;
var month;
var year;
var prevyear;
var prevmonth;
var nextyear;
var nextmonth;
var today_day;
var today_month;
var today_year;
var hour;
var minute;
var second;
var clock_set = 0;
dt = new Date();
today_year = dt.getFullYear();
today_month = dt.getMonth();
today_day = dt.getDate();


/**
 * Formats number to two digits.
 *
 * @param   int number to format.
 * @param   string type of number
 */
function formatNum2(i, valtype) {
    f = (i < 10 ? '0' : '') + i;
    if (valtype && valtype != '') {
        switch(valtype) {
            case 'month':
                f = (f > 12 ? 12 : f);
                break;

            case 'day':
                f = (f > 31 ? 31 : f);
                break;

            case 'hour':
                f = (f > 24 ? 24 : f);
                break;

            default:
            case 'second':
            case 'minute':
                f = (f > 59 ? 59 : f);
                break;
        }
    }

    return f;
}

/**
 * Formats number to two digits.
 *
 * @param   int number to format.
 * @param   int default value
 * @param   string type of number
 */
function formatNum2d(i, default_v, valtype) {
    i = parseInt(i, 10);
    if (isNaN(i)) return default_v;
    return formatNum2(i, valtype)
}

/**
 * Formats number to four digits.
 *
 * @param   int number to format.
 */
function formatNum4(i) {
    i = parseInt(i, 10)
    return (i < 1000 ? i < 100 ? i < 10 ? '000' : '00' : '0' : '') + i;
}

/**
 * Initializes calendar window.
 */
function initCalendar() {
    if (!year && !month && !day) {
        
        if (isNaN(year) || isNaN(month) || isNaN(day) || day == 0) {
            dt      = new Date();
            year    = dt.getFullYear();
            month   = dt.getMonth();
            day     = dt.getDate();
        }
        if (isNaN(hour) || isNaN(minute) || isNaN(second)) {
            dt      = new Date();
            hour    = dt.getHours();
            minute  = dt.getMinutes();
            second  = dt.getSeconds();
        }
    } else {
        /* Moving in calendar */
        if (month > 11) {
            month = 0;
            year++;
        }
        if (month < 0) {
            month = 11;
            year--;
        }
    }

    nextyear=year+1;
    prevyear=year-1;
            
    if (document.getElementById) {
        cnt = document.getElementById("calendar_data");
    } else if (document.all) {
        cnt = document.all["calendar_data"];
    }

    cnt.innerHTML = "";

    str = ""

    //heading table
    
    str += '';
    str += '<form method="NONE" onsubmit="return 0">';
    str += '<table class="calendar_header" cellspacing="0" cellpading="0"><tr><td width="30" align="center">';
    str += '<a class="wow" href="#calendar_data" onclick="year--; initCalendar();">&laquo;</a>&nbsp;&nbsp;<a class="wow" href="#calendar_data" onclick="month--; initCalendar();">&#139;</a>';
    str += '</td><td width="150"  align="center">';
    str += '<span>'+month_names[month]+' '+year+'</span>';
    str += '</td><td width="30"  align="center">';
    str += ' <a class="wow" href="#calendar_data" onclick="month++; initCalendar();">&#155;</a>&nbsp;&nbsp;<a class="wow" href="#calendar_data" onclick="year++; initCalendar();">&raquo;</a>';
    str += '</td></tr></table>';
    str += '</form>';
    str += '';
    
    str += '<table cellspacing="0" cellpadding="0" class="calendar_body"><tr>';
    for (i = 0; i < 7; i++) {
        str += '<td class="cb_header" width="30" align="left">' + day_names[i] + '</td>';
    }
    str += "</tr>";

    var firstDay = new Date(year, month, 1).getDay();
    var lastDay = new Date(year, month + 1, 0).getDate();
    
    if(month==0)
    {    
    	var lastDayLastMonth = new Date(prevyear, 12, 0).getDate();
    }
    else
    {
    	var lastDayLastMonth = new Date(year, month, 0).getDate();
    }

    str += "<tr>";

    dayInWeek = 0;
    for (i = firstDay; i > 0 ; i--) {
        
    	if(month>0)
	    {    
	    	prevyear=year;
	    	prevmonth=month;
	    }
	    else
	    {
	    	prevmonth=12;
	    }
    	
    	//actVal = "" + formatNum4(prevyear) + "-" + formatNum2(prevmonth, 'month') + "-" + formatNum2(lastDayLastMonth-i+1, 'day');
    	actVal = ""+ formatNum4(prevyear) + "-" + formatNum2(prevmonth, 'month') + "-" + formatNum2(lastDayLastMonth-i+1, 'day');
    	atitle = "" + (lastDayLastMonth-i+1) + " " + month_names[prevmonth-1] + " " + formatNum4(prevyear); 
    	
        str += '<td align="center" class="cb_befprev"><a title="'+ atitle +'" href="" onclick="returnDate(\'' + actVal + '\',\'' + atitle + '\');return false;">' + (lastDayLastMonth-i+1) + '</a></td>';
    	
        dayInWeek++;
    }
    for (i = 1; i <= lastDay; i++) {
        if (dayInWeek == 7) {
            str += "</tr><tr>";
            dayInWeek = 0;
        }

        dispmonth = 1 + month;

        /*if (window.opener.dateType == 'datetime' || window.opener.dateType == 'date') {
            actVal = "" + formatNum4(year) + "-" + formatNum2(dispmonth, 'month') + "-" + formatNum2(i, 'day');
        } else {*/
           // actVal = "" + formatNum4(year) + "-" + formatNum2(dispmonth, 'month') + "-" + formatNum2(i, 'day');
            actVal = "" + formatNum4(year) +  "-" + formatNum2(dispmonth, 'month') + "-" + formatNum2(i, 'day');
        /*}*/
        if (i == today_day&&year == today_year&&month == today_month) {
            style = ' class="cb_selected"';
            atitle = "" + (i) + " " + month_names[dispmonth-1] + " " + formatNum4(year); 
            current_date = actVal;
        } else {
            style = '';
            atitle = "" + (i) + " " + month_names[dispmonth-1] + " " + formatNum4(year); 
        }
                
        str += '<td align="center" title="'+ atitle +'" '+ style + '><a class="bow" href="" onclick="returnDate(\'' + actVal + '\',\'' + atitle + '\');return false;">' + i + '</a></td>';
        dayInWeek++;
    }
    
    for (i = dayInWeek; i < 7; i++) {
    	
    	if(dispmonth<12)
    	{
    		nextyear=year;
    		nextmonth=dispmonth+1;
    	}
    	else
    	{
    		nextmonth=1;
    	}
    	
    	atitle = "" + (i-dayInWeek+1) + " " + month_names[nextmonth-1] + " " + formatNum4(nextyear); 
    	   	
    	//actVal = "" + formatNum4(nextyear) + "-" + formatNum2(nextmonth, 'month') + "-" + formatNum2(i-dayInWeek+1, 'day');
    	actVal = "" + formatNum4(nextyear) + "-" + formatNum2(nextmonth, 'month') + "-" + formatNum2(i-dayInWeek+1, 'day');
    	
        str += '<td align="center" class="cb_befprev"><a title="'+ atitle +'" href="" onclick="returnDate(\'' + actVal + '\',\'' + atitle + '\');return false;">' + (i-dayInWeek+1) + '</a></td>';
        
    }

    str += "</tr></table>";

    cnt.innerHTML = str;
}

/**
 * Returns date from calendar.
 *
 * @param   string     date text
 */
function returnDate(d,sd) {
    $(dateField).value=d;
    if($(dateField+'_show')){$(dateField+'_show').innerHTML=sd;}
    $('overdiv0').remove();
}