var weekend = [0,6];
var weekendColor = "#e0e0e0";
var linkColor = "#009900";
var fontface = "Verdana";
var fontsize = 8; // in "pt" units; used with "font-size" style element

// Set to true to allow old months to be shown
var previousMonthScan = false;

var gNow = new Date();
var ggWinContent;
var ggPosX = -1;
var ggPosY = -1;

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_month, p_year, p_format) {
        if ((p_month == null) && (p_year == null))        return;

        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;

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_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;
}

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 = "";

        // Begin Table Drawing code here..
        vCode += ("<div align=center><TABLE BORDER=1 BGCOLOR=\"" + this.gBGColor + "\" style='font-size:" + fontsize + "pt;'>");

        vHeader_Code = this.cal_header();
        vData_Code = this.cal_data();
        vCode += (vHeader_Code + vData_Code);

        vCode += "</TABLE></div>";

        return vCode;
}

Calendar.prototype.show = function() {
        var vCode = "";

        // 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];

        if(!previousMonthScan){
        ggWinContent += ("<TABLE WIDTH='100%' BORDER=1 CELLSPACING=0 CELLPADDING=0 BGCOLOR='#e0e0e0' style='font-size:" + fontsize + "pt;'><TR><TD ALIGN=center width='50%'>");
        ggWinContent += ("<A HREF=\"javascript:void(0);\" " +
                "onMouseOver=\"window.status='Previous Month'; return true;\" " +
                "onMouseOut=\"window.status=''; return true;\" " +
                "onClick=\"Build(" +
                "'" + this.gReturnItem + "', '" + prevMM + "', '" + prevYYYY + "', '" + this.gFormat + "'" +
                ");" +
                "\"><FONT COLOR=\"" + linkColor + "\">Previous</FONT><\/A></TD><TD ALIGN=center  width='50%'>");
        }
        ggWinContent += ("<A HREF=\"javascript:void(0);\" " +
                "onMouseOver=\"window.status='Next Month'; return true;\" " +
                "onMouseOut=\"window.status=''; return true;\" " +
                "onClick=\"Build(" +
                "'" + this.gReturnItem + "', '" + nextMM + "', '" + nextYYYY + "', '" + this.gFormat + "'" +
                ");" +
                "\"><FONT COLOR=\"" + linkColor + "\">Next</FONT><\/A></TD></TR></TABLE><BR>");
                
        ggWinContent += ("<FONT FACE='" + fontface + "' ><B>");
        ggWinContent += (this.gMonthName + " " + this.gYear);
        ggWinContent += "</B><BR>";

        // Get the complete calendar code for the month, and add it to the
        //        content var
        vCode = this.getMonthlyCalendarCode();
        ggWinContent += vCode;
}

Calendar.prototype.cal_header = function() {
        var vCode = "";

        vCode = vCode + "<TR>";
        vCode = vCode + "<TD WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='#FF0000'><B>Sun</B></FONT></TD>";
        vCode = vCode + "<TD WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='#0000FF'><B>Mon</B></FONT></TD>";
        vCode = vCode + "<TD WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='#0000FF'><B>Tue</B></FONT></TD>";
        vCode = vCode + "<TD WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='#0000FF'><B>Wed</B></FONT></TD>";
        vCode = vCode + "<TD WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='#0000FF'><B>Thu</B></FONT></TD>";
        vCode = vCode + "<TD WIDTH='14%'><FONT FACE='" + fontface + "' COLOR='#0000FF'><B>Fri</B></FONT></TD>";
        vCode = vCode + "<TD WIDTH='16%'><FONT FACE='" + fontface + "' COLOR='#FF0000'><B>Sat</B></FONT></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 WIDTH='14%'" + this.write_weekend_string(i) + "><FONT FACE='" + fontface + "'> </FONT></TD>";
        }

        // Write rest of the 1st week
        for (j=vFirstDay; j<7; j++) {
                if(vDay < gNow.getDate() && this.gMonth <= gNow.getMonth() && this.gYear <= gNow.getFullYear()){
                vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "' COLOR='BLACK'>" +
                        vDay + "</FONT></TD>";
                }else if(this.gYear < gNow.getFullYear()){
                vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "' COLOR='BLACK'>" +
                        vDay + "</FONT></TD>";
                }else{
                vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "'>" +
                        "<A HREF='javascript:void(0);' " +
                                "onMouseOver=\"window.status='set date to " + this.format_data(vDay) + "'; return true;\" " +
                                "onMouseOut=\"window.status=' '; return true;\" " +
                                "onClick=\"document." + this.gReturnItem + ".value='" +
                                this.format_data(vDay) +
                                "';nd();nd();\">" +
                                this.format_day(vDay) +
                        "</A>" +
                        "</FONT></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++) {
                        if(vDay < gNow.getDate() && this.gMonth <= gNow.getMonth() && this.gYear <= gNow.getFullYear()){
                        vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "' COLOR='BLACK'>" +
                                vDay + "</FONT></TD>";
                        }else if(this.gYear < gNow.getFullYear()){
                        vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "' COLOR='BLACK'>" +
                                vDay + "</FONT></TD>";
                        }else{
                        vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT FACE='" + fontface + "'>" +
                                "<A HREF='javascript:void(0);' " +
                                        "onMouseOver=\"window.status='set date to " + this.format_data(vDay) + "'; return true;\" " +
                                        "onMouseOut=\"window.status=' '; return true;\" " +
                                        "onClick=\"document." + this.gReturnItem + ".value='" +
                                        this.format_data(vDay) +
                                        "';window.scroll(0,ggPosY);nd();nd();\">" +
                                this.format_day(vDay) +
                                "</A>" +
                                "</FONT></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 WIDTH='14%'" + this.write_weekend_string(j+m) +
                        "><FONT FACE='" + fontface + "' COLOR='gray'> </FONT></TD>";
                else
                        vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j+m) +
                        "><FONT FACE='" + fontface + "' COLOR='gray'>" + m + "</FONT></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 ("<FONT COLOR=\"RED\"><B>" + vday + "</B></FONT>");
        else
                return ("<FONT COLOR=\"" + linkColor + "\">" + vday + "</FONT>");
}

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\/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 "mm-dd-yyyy":
                        vData = vMonth + "-" + vDD + "-" + vY4;
                        break;
                default:
                        vData = vMonth + "-" + vDD + "-" + vY4;
                        break;
        }

        return vData;
}

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

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

        // initialize the content string
        ggWinContent = "";

        gCal.show();

        // if this is the first calendar popup, use autopositioning with an offset
        if (ggPosX == -1 && ggPosY == -1) {
                overlib(ggWinContent, AUTOSTATUSCAP, STICKY, CLOSECLICK, CSSSTYLE,
                        TEXTSIZEUNIT, "pt", TEXTSIZE, 8, CAPTIONSIZEUNIT, "pt", CAPTIONSIZE, 8, CLOSESIZEUNIT, "pt", CLOSESIZE, 8,
                        CAPTION, "Select a date", OFFSETX, 20, OFFSETY, -20, FGCOLOR, "#FFFFFF", CLOSECOLOR, "#FFFFFF");
                // save where the 'over' div ended up; we want to stay in the same place if the user
                //        clicks on one of the year or month navigation links
                if ( (ns4) || (ie4) ) {
                        ggPosX = parseInt(over.left);
                        ggPosY = parseInt(over.top);
                        } else if (ns6) {
                        ggPosX = parseInt(over.style.left);
                        ggPosY = parseInt(over.style.top);
                        }
                }
        else {
                // we have a saved X & Y position, so use those with the FIXX and FIXY options
                overlib(ggWinContent, AUTOSTATUSCAP, STICKY, CLOSECLICK, CSSSTYLE,
                        TEXTSIZEUNIT, "pt", TEXTSIZE, 8, CAPTIONSIZEUNIT, "pt", CAPTIONSIZE, 8, CLOSESIZEUNIT, "pt", CLOSESIZE, 8,
                        CAPTION, "Select a date", FIXX, ggPosX, FIXY, ggPosY, FGCOLOR, "#FFFFFF", CLOSECOLOR, "#FFFFFF");
                }
        window.scroll(ggPosX, ggPosY);
}

function show_calendar() {
        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];

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