var weekend = [0,6];
var weekendColor = "#ADD0D6";
var fontface = "Verdana";
var fontsize = 2;
var gNow = new Date();
var ggWinCal;
isNav = (navigator.appName.indexOf("Netscape") != -1) ? true : false;
isIE = (navigator.appName.indexOf("Microsoft") != -1) ? true : false;
Calendar.Months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

// Non-Leap year Month days..
Calendar.DOMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
// Leap year Month days..
Calendar.lDOMonth = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function Calendar(p_item, p_WinCal, p_month, p_year, p_format) {
    if ((p_month == null) && (p_year == null))  return;

    if (p_WinCal == null)
        this.gWinCal = ggWinCal;
    else
        this.gWinCal = p_WinCal;
    
    if (p_month == null) {
        this.gMonthName = null;
        this.gMonth = null;
        this.gYearly = true;
    } else {
        this.gMonthName = Calendar.get_month(p_month);
        this.gMonth = new Number(p_month);
        this.gYearly = false;
    }

    this.gYear = p_year;
    this.gFormat = p_format;
    this.gBGColor = "white";
    this.gFGColor = "black";
    this.gTextColor = "black";
    this.gHeaderColor = "black";
    this.gReturnItem = p_item;
}

Calendar.get_month = Calendar_get_month;
Calendar.get_daysofmonth = Calendar_get_daysofmonth;
Calendar.calc_month_year = Calendar_calc_month_year;
Calendar.print = Calendar_print;

function Calendar_get_month(monthNo) {
    return Calendar.Months[monthNo];
}

function Calendar_get_daysofmonth(monthNo, p_year) {
    /* 
    Check for leap year ..
    1.Years evenly divisible by four are normally leap years, except for... 
    2.Years also evenly divisible by 100 are not leap years, except for... 
    3.Years also evenly divisible by 400 are leap years. 
    */
    if ((p_year % 4) == 0) {
        if ((p_year % 100) == 0 && (p_year % 400) != 0)
            return Calendar.DOMonth[monthNo];
    
        return Calendar.lDOMonth[monthNo];
    } else
        return Calendar.DOMonth[monthNo];
}

function Calendar_print() {
    ggWinCal.print();
}

function Calendar_calc_month_year(p_Month, p_Year, incr) {
    /* 
    Will return an 1-D array with 1st element being the calculated month 
    and second being the calculated year 
    after applying the month increment/decrement as specified by 'incr' parameter.
    'incr' will normally have 1/-1 to navigate thru the months.
    */
    var ret_arr = new Array();
    
    if (incr == -1) {
        // B A C K W A R D
        if (p_Month == 0) {
            ret_arr[0] = 11;
            ret_arr[1] = parseInt(p_Year) - 1;
        }
        else {
            ret_arr[0] = parseInt(p_Month) - 1;
            ret_arr[1] = parseInt(p_Year);
        }
    } else if (incr == 1) {
        // F O R W A R D
        if (p_Month == 11) {
            ret_arr[0] = 0;
            ret_arr[1] = parseInt(p_Year) + 1;
        }
        else {
            ret_arr[0] = parseInt(p_Month) + 1;
            ret_arr[1] = parseInt(p_Year);
        }
    }
    return ret_arr;
}

// This is for compatibility with Navigator 3, we have to create and discard one object before the prototype object exists.
new Calendar();

Calendar.prototype.getMonthlyCalendarCode = function() {
    var vCode = "";
    var vHeader_Code = "";
    var vData_Code = "";
    
    // Show navigation buttons
    var prevMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, -1);
    var prevMM = prevMMYYYY[0];
    var prevYYYY = prevMMYYYY[1];

    var nextMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, 1);
    var nextMM = nextMMYYYY[0];
    var nextYYYY = nextMMYYYY[1];

    // Drawing of the DATE table
    vCode = vCode + "<div style='border:1px solid #000000; padding:4px; margin: 4px;'><div style='font-size: 14px; font-weight: bold; color: #000000;' align='center'>" 
    + "<A style='text-decoration: none; font-size: 12px; font-weight: normal; color: #000000;' HREF=\"" + "javascript:window.opener.Build(" + "'" + this.gReturnItem + "', '" + prevMM + "', '" + prevYYYY + "', '" + this.gFormat + "'" + ");" + "\"> << &nbsp;<\/A>"
    + this.gMonthName + " " + this.gYear 
    + "<A style='text-decoration: none; font-size: 12px; font-weight: normal; color: #000000;' HREF=\"" + "javascript:window.opener.Build(" +  "'" + this.gReturnItem + "', '" + nextMM + "', '" + nextYYYY + "', '" + this.gFormat + "'" + ");" + "\"> &nbsp;>> <\/A>"
    + "</div><TABLE width='100%' align=center BORDER=0 CELLSPACING=1>";
    
    vHeader_Code = this.cal_header();
    vData_Code = this.cal_data();
    vCode = vCode + vHeader_Code + vData_Code;
    
    vCode = vCode + "</TABLE></div>";
    
    return vCode;
}

Calendar.prototype.show = function() {
    var vCode = "";
    
    this.gWinCal.document.open();

    // Setup the page...
    this.wwrite("<html>");
    this.wwrite("<head><title>Calendar</title>");
    this.wwrite("</head>");

    this.wwrite("<body>");
    this.wwrite("<TABLE cellSpacing=0 align='center' cellPadding=0 width=200 border=0><TBODY><TR><TD style='font-size:18px;text-align:center;font-weight:bold;'>Select A Date</TD></TR></TBODY></TABLE>");

    // Get the complete calendar code for the month..
    vCode = this.getMonthlyCalendarCode();
    this.wwrite(vCode);

    this.wwrite("</body></html>");
    this.gWinCal.document.close();
}



Calendar.prototype.wwrite = function(wtext) {
    this.gWinCal.document.writeln(wtext);
}

Calendar.prototype.wwriteA = function(wtext) {
    this.gWinCal.document.write(wtext);
}

Calendar.prototype.cal_header = function() {
    var vCode = "";
    
    vCode = vCode + "<TR>";
    vCode = vCode + "<TD align='center' WIDTH='14%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>Su</div></TD>";
    vCode = vCode + "<TD align='center' WIDTH='14%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>Mo</div></TD>";
    vCode = vCode + "<TD align='center' WIDTH='14%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>Tu</div></TD>";
    vCode = vCode + "<TD align='center' WIDTH='14%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>We</div></TD>";
    vCode = vCode + "<TD align='center' WIDTH='14%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>Th</div></TD>";
    vCode = vCode + "<TD align='center' WIDTH='14%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>Fr</div></TD>";
    vCode = vCode + "<TD align='center' WIDTH='16%'><div style='font-style:Verdana; font-size: 11px; font-weight:bold;'>Sa</div></TD>";
    vCode = vCode + "</TR>";
    
    return vCode;
}

Calendar.prototype.cal_data = function() {
    var vDate = new Date();
    vDate.setDate(1);
    vDate.setMonth(this.gMonth);
    vDate.setFullYear(this.gYear);

    var vFirstDay=vDate.getDay();
    var vDay=1;
    var vLastDay=Calendar.get_daysofmonth(this.gMonth, this.gYear);
    var vOnLastDay=0;
    var vCode = "";

    /*
    Get day for the 1st of the requested month/year..
    Place as many blank cells before the 1st day of the month as necessary. 
    */

    vCode = vCode + "<TR>";
    for (i=0; i<vFirstDay; i++) {
        vCode = vCode + "<TD bgcolor='CCCCCC' align='center' WIDTH='14%'" + this.write_weekend_string(i) + ">&nbsp;</TD>";
    }

    // Write rest of the 1st week
    for (j=vFirstDay; j<7; j++) {
            isToday = this.format_day(vDay);
            if(isToday)
                bckcolor = '999999';
               else 
                bckcolor = '333333';
        vCode = vCode + "<TD bgcolor='#" + bckcolor + "'align='center' WIDTH='14%'" + this.write_weekend_string(j) + "><span style='font-style:Verdana; font-size: 14px; font-weight:bold;'>" + 
            "<A style='color:#ffffff; text-decoration:none;' HREF='#' " + 
                "onClick=\"self.opener.document." + this.gReturnItem + ".value='" + 
                this.format_data(vDay) + 
                "';window.close();\">" + 
                vDay + 
            "</A>" + 
            "</span>&nbsp;</TD>";
        vDay=vDay + 1;
    }
    vCode = vCode + "</TR>";

    // Write the rest of the weeks
    for (k=2; k<7; k++) {
        vCode = vCode + "<TR>";

        for (j=0; j<7; j++) {
            isToday = this.format_day(vDay);
            if(isToday)
                bckcolor = '999999';
               else 
                bckcolor = '333333';

            vCode = vCode + "<TD bgcolor='#" + bckcolor + "' align='center' WIDTH='14%'" + this.write_weekend_string(j) + "><span style='font-style:Verdana; font-size: 14px; font-weight:bold;'>" + 
                "<A style='color:#ffffff; text-decoration:none;' HREF='#' " + 
                    "onClick=\"self.opener.document." + this.gReturnItem + ".value='" + 
                    this.format_data(vDay) + 
                    "';window.close();\">" + 
                    vDay + 
                "</A>" + 
                "</span>&nbsp;</TD>";
            vDay=vDay + 1;

            if (vDay > vLastDay) {
                vOnLastDay = 1;
                break;
            }
        }

        if (j == 6)
            vCode = vCode + "</TR>";
        if (vOnLastDay == 1)
            break;
    }
    
    // Fill up the rest of last week with proper blanks, so that we get proper square blocks
    for (m=1; m<(7-j); m++) {
        if (this.gYearly)
            vCode = vCode + "<TD bgcolor='#CCCCCC' WIDTH='14%'" + this.write_weekend_string(j+m) + 
            ">&nbsp;</TD>";
        else
            vCode = vCode + "<TD bgcolor='#CCCCCC' WIDTH='14%'" + this.write_weekend_string(j+m) + 
            ">&nbsp;</TD>";
    }
    
    return vCode;
}

Calendar.prototype.format_day = function(vday) {
    var vNowDay = gNow.getDate();
    var vNowMonth = gNow.getMonth();
    var vNowYear = gNow.getFullYear();

    if (vday == vNowDay && this.gMonth == vNowMonth && this.gYear == vNowYear)
        return (1);
    else
        return (0);
}

Calendar.prototype.write_weekend_string = function(vday) {
    var i;

    // Return special formatting for the weekend day.
    for (i=0; i<weekend.length; i++) {
        if (vday == weekend[i])
            return (" BGCOLOR=\"" + weekendColor + "\"");
    }
    
    return "";
}

Calendar.prototype.format_data = function(p_day) {
    var vData;
    var vMonth = 1 + this.gMonth;
    vMonth = (vMonth.toString().length < 2) ? "0" + vMonth : vMonth;
    var vMon = Calendar.get_month(this.gMonth).substr(0,3).toUpperCase();
    var vFMon = Calendar.get_month(this.gMonth).toUpperCase();
    var vY4 = new String(this.gYear);
    var vY2 = new String(this.gYear.substr(2,2));
    var vDD = (p_day.toString().length < 2) ? "0" + p_day : p_day;
    
    switch (this.gFormat) {
        case "MM\/DD\/YYYY" :
            vData = vMonth + "\/" + vDD + "\/" + vY4;
            break;
        case "MM\/DD\/YY" :
            vData = vMonth + "\/" + vDD + "\/" + vY2;
            break;
        case "MM-DD-YYYY" :
            vData = vMonth + "-" + vDD + "-" + vY4;
            break;
        case "MM-DD-YY" :
            vData = vMonth + "-" + vDD + "-" + vY2;
            break;

        case "DD\/MON\/YYYY" :
            vData = vDD + "\/" + vMon + "\/" + vY4;
            break;
        case "DD\/MON\/YY" :
            vData = vDD + "\/" + vMon + "\/" + vY2;
            break;
        case "DD-MON-YYYY" :
            vData = vDD + "-" + vMon + "-" + vY4;
            break;
        case "DD-MON-YY" :
            vData = vDD + "-" + vMon + "-" + vY2;
            break;

        case "DD\/MONTH\/YYYY" :
            vData = vDD + "\/" + vFMon + "\/" + vY4;
            break;
        case "DD\/MONTH\/YY" :
            vData = vDD + "\/" + vFMon + "\/" + vY2;
            break;
        case "DD-MONTH-YYYY" :
            vData = vDD + "-" + vFMon + "-" + vY4;
            break;
        case "DD-MONTH-YY" :
            vData = vDD + "-" + vFMon + "-" + vY2;
            break;

        case "DD\/MM\/YYYY" :
            vData = vDD + "\/" + vMonth + "\/" + vY4;
            break;
        case "DD\/MM\/YY" :
            vData = vDD + "\/" + vMonth + "\/" + vY2;
            break;
        case "DD-MM-YYYY" :
            vData = vDD + "-" + vMonth + "-" + vY4;
            break;
        case "DD-MM-YY" :
            vData = vDD + "-" + vMonth + "-" + vY2;
            break;

        case "YYYY-MM-DD" :
            vData = vY4 + "-" + vMonth + "-" + vDD;
            break;            
            
        default :
            vData = vMonth + "\/" + vDD + "\/" + vY4;
    }

    return vData;
}

function Build(p_item, p_month, p_year, p_format) {
    var p_WinCal = ggWinCal;
    gCal = new Calendar(p_item, p_WinCal, p_month, p_year, p_format);

    // Customize your Calendar here..
    gCal.gBGColor="white";
    gCal.gLinkColor="black";
    gCal.gTextColor="black";
    gCal.gHeaderColor="black";

    // Choose appropriate show function
    if (gCal.gYearly)   gCal.showY();
    else    gCal.show();
}

function show_calendar() {
    /* 
        p_month : 0-11 for Jan-Dec; 12 for All Months.
        p_year  : 4-digit year
        p_format: Date format (mm/dd/yyyy, dd/mm/yy, ...)
        p_item  : Return Item.
    */

    p_item = arguments[0];
    if (arguments[1] == null)
        p_month = new String(gNow.getMonth());
    else
        p_month = arguments[1];
    if (arguments[2] == "" || arguments[2] == null)
        p_year = new String(gNow.getFullYear().toString());
    else
        p_year = arguments[2];
    if (arguments[3] == null)
        p_format = "MM-DD-YYYY";
    else
        p_format = arguments[3];

    vWinCal = window.open("", "Calendar", 
        "width=230,height=240,status=no,resizable=no,top=200,left=200");
    vWinCal.opener = self;
    ggWinCal = vWinCal;

    Build(p_item, p_month, p_year, p_format);
}
/*
Yearly Calendar Code Starts here
*/
function show_yearly_calendar(p_item, p_year, p_format) {
    // Load the defaults..
    if (p_year == null || p_year == "")
        p_year = new String(gNow.getFullYear().toString());
    if (p_format == null || p_format == "")
        p_format = "MM/DD/YYYY";

    var vWinCal = window.open("", "Calendar", "scrollbars=yes");
    vWinCal.opener = self;
    ggWinCal = vWinCal;

    Build(p_item, null, p_year, p_format);
}