// JavaScript Events//
// Version: 1.0
// Date: 
//
// Configurable values are set to defaults here; can override them before calling Calendar( ) from the HTML page
var SpecialDay=1;	
// 1=Sunday, 2=Monday, . . . 7=Saturday
var FontSize=5;
var ColorBackground="ffffcc";
var ColorSpecialDay = "#2964A3";
var ColorToday = "green";
var ColorEvent = "red";
// Initialize the range of the calendar to Jan - Dec of the current year.  Calls to DefineEvent( ) will change this
// as needed; it is also possible to explicitly override the range before calling Calendar( ) from the HTML page.
var today = new Date();
var FirstMonth=GetFullYear(today) * 100 + 1;
var LastMonth=FirstMonth + 11;
// Events[] is a SPARSE array; Call DefineEvent( ) to populate it
var Events = new Array;
// Each event is defined by calling the DefineEvent( ) routine with the following parameters:
//
//   DefineEvent(EventDate, EventDescription, EventLink, Image, Width, Height)
//        EventDate is a numeric value in the format YYYYMMDD
//        EvenDescription is a string that can include embedded HTML tags (e.g., <br />, <strong>, etc.)
//        EventLink is the URL of the target page if a hyperlink is desired from this event entry
//        Image is the URL of the image if you want to display an image with this event
//        Width is the width of the image in pixels
//        Height is the height of the image in pixels
function DefineEvent(EventDate, EventDescription, EventLink, Image, Width, Height) 
{
	var tmp;
// Build the HTML string for this event: image (optional), link (optional), and description
	tmp = "";
	if (Image != "")
		tmp = tmp + '<img src="getobject.js"  width="' + Width + '" height="' + Height + '" align="left" valign="top">';
	if (EventLink != "") {
		tmp = tmp + '<a href="javascript:ow('; 
                tmp = tmp + "'" + EventLink + "'" + ", "; 
                tmp = tmp + "'BOA'" +", ";
                tmp = tmp + "'width=820,height=800,scrollbars=1,resizable=1,toolbar=0,location=0,directories=0,status=0'";
                tmp = tmp +');">';
        }
	tmp = tmp + EventDescription;
	if (EventLink != "")
                tmp = tmp + '</a>';
	// If an event already exists for this date, append the new event to it.
	if (Events[EventDate])
		Events[EventDate] += "<br />" + tmp;
	else
		Events[EventDate] = tmp;
	// Adjust the minimum and maximum month & year to include this date
	tmp = Math.floor(EventDate / 100);
	if (tmp < FirstMonth)
                FirstMonth = tmp;
	if (tmp > LastMonth)
                LastMonth = tmp;
}
// Utility function to populate an array with values
function arr() {
	for (var n=0;n<arr.arguments.length;n++) {
		this[n+1] = arr.arguments[n];
	}
}
// Create the array of month names (used in various places)
var months = new arr("January","February","March","April","May","June","July","August","September","October","November","December");
// Calendar( ) is the only routine that needs to be called to display the calendar
function Calendar( ) {
	var curdy, curmo, yr, mo, dy, dayofweek, yearmonth, bgn, lastday, jump;
	var weekdays = new arr("Sun","Mon","Tue","Wed","Thu","Fri","Sat");
	var thispage = window.location.pathname;
	// Save current day and month for comparison
	curdy = today.getDate();
	curmo = today.getMonth()+1;
	// Default to current month and year
	mo = curmo;
	yr = GetFullYear(today);
	yearmonth = (yr * 100) + mo;
	// If querystring parameter is present, get the month/year ("calendar.htm?YYYYMM")
	if (location.search.length > 1) {
		yearmonth = parseInt(location.search.substring(1,location.search.length));
		if ((""+yearmonth).length == 6) {
			mo = yearmonth % 100;
			yr = (yearmonth - mo) / 100;
		}
	}
	// Constrain to the range of months with events
	if (yearmonth < FirstMonth) {
		mo = FirstMonth % 100;
		yr = (FirstMonth - mo) / 100;
		yearmonth = FirstMonth;
	}
	if (yearmonth > LastMonth) {
		mo = LastMonth % 100;
		yr = (LastMonth - mo) / 100;
		yearmonth = LastMonth;
	}
	// Create a date object for the first day of the desired month
	bgn = new Date(months[mo] + " 1," + yr);
	// Get the day-of-week of the first day, and the # days in the month
	dayofweek = bgn.getDay();
	lastday = NumDaysIn(mo,yr);
	document.write("<table width='100%' border='2' bgcolor='"+ColorBackground+"'><tr><td width='100%' align='center' colspan='7'><font size='"+FontSize+"'>"+months[mo]+" "+yr+"</font></td></tr><tr>");
	for (var i=1;i<=7;i++){
		document.write("<td align='center' width='14%'><font color='#2964A3' size='4'>"+weekdays[i]+"</font></td>");
	}
	document.write("</tr><tr>");
	dy = 1;
	// Special handling for the first week of the month
	for (var i=1;i<=7;i++) {
		// If the day is less than the day of the
		// week determined to be the first day
		// of the month, print a space in
		// this cell of the table.
		if (i <= dayofweek){
			document.write("<td align='center'><font size='"+FontSize+"'>&nbsp;</font></td>");
		}
		// Otherwise, write date and the event,
		// if any, in this cell of the table.
		else {
			ShowDate(yr,mo,dy,i,curmo,curdy);
			dy++;
		}
	}
	document.write("</tr><tr>");
	// Rest of the weeks . . .
	while (dy <= lastday) {
		for (var i=1;i<=7;i++) {
			// If the day is greater than the last
			// day of the month, print a space in
			// this cell of the table.
			if (dy > lastday) {
				document.write("<td align='center'>&nbsp;</td>");
			}
			// Otherwise, write date and the event,
			// if any, in this cell of the table.
			else {
				ShowDate(yr,mo,dy,i,curmo,curdy);
				dy++;
			}		}
		document.write("</tr><tr>");
	}
	jump = "";
	if (yearmonth > FirstMonth)
		jump += '<a href="' + thispage + '?'+PrevYearMonth(yearmonth)+'"><-- View '+months[PrevMonth(mo)]+'</a>';
	if ((yearmonth > FirstMonth) && (yearmonth < LastMonth))
		jump += "   |   ";
	if (yearmonth < LastMonth)
		jump += '<a href="' + thispage + '?'+NextYearMonth(yearmonth)+'">View '+months[NextMonth(mo)]+' --></a>';
	document.write("</tr><tr><td colspan='7' align='center'>"+jump+"</td></tr>");
	document.write("<tr><td colspan='7' align='center' valign='middle'><form>Jump to month:  ");
	BuildSelectionList(yearmonth, thispage);
	document.write("</form></td></tr></table>");
}
// Display a date in the appropriate color, with events (if there are any)
function ShowDate(yr, mo, dy, dayofweek, currentmonth, currentday) {
	var ind, HighlightEvent, tmp;
	document.write("<td align='center' valign='top'><p align='right'><font size='"+FontSize+"'");
	HighlightEvent = true;
	if (dayofweek == SpecialDay) {
		document.write(" color='" + ColorSpecialDay+"'");
	}
	if ((mo == currentmonth) && (dy == currentday)) {
		document.write(" color='" + ColorToday+"'");
		HighlightEvent = false;
	}
	ind = (((yr * 100) + mo) * 100) + dy;
	if (Events[ind]) {
		tmp = Events[ind];
		if (HighlightEvent) {
			 document.write(" color='" + ColorEvent+"'");
		}
	}
	 else
		 tmp="&nbsp;<br />&nbsp;";
	document.write(">"+dy+"</align></font></p><font size='1'>"+tmp+"</td>");
}
// Remaining routines are utilities used above
function NumDaysIn(mo,yr) {
	if (mo==4 || mo==6 || mo==9 || mo==11) return 30;
	else if ((mo==2) && LeapYear(yr)) return 29;
	else if (mo==2) return 28;
	else return 31;
}
function LeapYear(yr) {
	if (((yr % 4 == 0) && yr % 100 != 0) || yr % 400 == 0)
	 return true;
	else
	 return false;
}
// fixes a Netscape 2 and 3 bug
function GetFullYear(d) { 
// d is a date object
        var yr;
	yr = d.getYear();
	if (yr < 1000)
	 yr +=1900;
	return yr;
}
function PrevMonth(mth) {
	if (mth == 1)
	 return 12;
	else
	 return (mth-1);
}
function NextMonth(mth) {
	if (mth == 12)
	 return 1;
	else
	 return (mth+1);
}
function PrevYearMonth(yrmth) {
	if ((yrmth % 100) == 1)
	 return ((yrmth-100)+11);
	else
	 return (yrmth-1);
}
function NextYearMonth(yrmth) {
	if ((yrmth % 100) == 12)
	 return ((yrmth-11)+100);
	else
	 return (yrmth+1);
}
function JumpTo(calendar, thispage) {
	var sel, yrmo;
	sel = calendar.selectedIndex;
	yrmo = calendar.form.jumpmonth[sel].value;
	document.location = thispage + "?" + yrmo;
}
function BuildSelectionList(current,thispage) {
	var mo, yr, yearmonth;
	yearmonth = FirstMonth;
	document.write("<select name=\"jumpmonth\" size=1 onchange=\"JumpTo(this,'" + thispage + "')\">");
	while (yearmonth <= LastMonth) {
		mo = yearmonth % 100;
		yr = (yearmonth - mo) / 100;
		document.write("<option value=");
		document.write(yearmonth);
		if (yearmonth == current)
		 document.write(" selected");
		document.write(">");
		document.write(months[mo]+" "+yr);
		yearmonth = NextYearMonth(yearmonth);
	}
	document.write("</select>");
}