var selectedYear=2006;
var selectedMonth=12;
var target;

var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];

function fillCalendar(y,m){
    var now = new Date(); // so we can highlight today if possible
	var todayY=now.getYear();
	var todayM=now.getMonth();
	var todayD=now.getDate();
	
	if (y<500) y+=1900;
	var startDate= new Date(y,m,1);
	sOut="<table width=\"100%\" cellpadding=\"0\" cellspacing=\"0\"><tr><th><p>M</p></th><th><p>T</p></th><th><p>W</p></th><th><p>T</p></th>	<th><p>F</p></th><th><p>S</p></th><th><p>S</p></th></tr>";
	var iStart=startDate.getDay();
	// fudge to make sunday the last day of the week
	if (iStart==0) iStart=7;
	var iEnd=getMonthDays(y,m);
	var iCounter=iStart;
	sOut+="<tr>";
	for (var i=1;i<iStart;i++) { 
		sOut+="<td></td>";
	}
	for (var i=1;i<=iEnd;i++) {
		sOut+="<td";
		if ((todayD==i)&&(todayM==m)&&(todayY==y)) sOut+=" class=\"today\"";
		else if ((iCounter==6)||(iCounter==7)) sOut+=" class=\"we\"";
		sOut+="><p><a href=\"javascript:selectDate('"+i+"/"+(m+1)+"/"+y+"');\">"+i+"</a></p></td>";
		iCounter++;
		if (iCounter==8){
			iCounter=1;
			sOut+="</tr><tr>";
		}
	}

	sOut+="</tr></table>";
	
    selectedYear  = y;  // Remember year & month selected
    selectedMonth = m; // as global variables
	document.getElementById("thisMonth").innerHTML = months[m]+" "+y;
	document.getElementById("monthlist").innerHTML = sOut;
}
  function changeMonth(n){
  // increment or decrement selectedMonth
    var x = +selectedMonth+n;
    if ( x > 11 ) {
      x =0;
      selectedYear += 1;
    }
    if ( x < 0 ) {
      x =11;
      selectedYear -= 1;
    }
    fillCalendar(selectedYear,x);
  }
  
function getMonthDays(y,m) {
    if ( m==3 || m==5 || m==8 || m==10) {
        return 30;
    }
    if ( m==1 ) {
        if (y%4==0 && ( y%100!=0 || y%400==0)) {
            return 29;
        }
        return 28;
    }
    return 31;

} 
function selectDate(s){
	target.value=s;
	hide('calendar');
}
function showCalendar(t,a){
	// t is the name of the text box where we'll write the date
	target=document.getElementById(t);
	document.getElementById("calendar").style.left = getAnchorPosition(a).x;
	document.getElementById("calendar").style.top = getAnchorPosition(a).y;
	show('calendar');
}
// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. 
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

/* 
AnchorPosition.js
Author: Matt Kruse
Last modified: 10/11/02

DESCRIPTION: These functions find the position of an <A> tag in a document,
so other elements can be positioned relative to it.

COMPATABILITY: Netscape 4.x,6.x,Mozilla, IE 5.x,6.x on Windows. Some small
positioning errors - usually with Window positioning - occur on the 
Macintosh platform.

FUNCTIONS:
getAnchorPosition(anchorname)
  Returns an Object() having .x and .y properties of the pixel coordinates
  of the upper-left corner of the anchor. Position is relative to the PAGE.

getAnchorWindowPosition(anchorname)
  Returns an Object() having .x and .y properties of the pixel coordinates
  of the upper-left corner of the anchor, relative to the WHOLE SCREEN.

NOTES:

1) For popping up separate browser windows, use getAnchorWindowPosition. 
   Otherwise, use getAnchorPosition

2) Your anchor tag MUST contain both NAME and ID attributes which are the 
   same. For example:
   <A NAME="test" ID="test"> </A>

3) There must be at least a space between <A> </A> for IE5.5 to see the 
   anchor tag correctly. Do not do <A></A> with no space.
*/ 

// getAnchorPosition(anchorname)
//   This function returns an object having .x and .y properties which are the coordinates
//   of the named anchor, relative to the page.
function getAnchorPosition(anchorname) {
	// This function will return an Object with x and y properties
	var useWindow=false;
	var coordinates=new Object();
	var x=0,y=0;
	// Browser capability sniffing
	var use_gebi=false, use_css=false, use_layers=false;
	if (document.getElementById) { use_gebi=true; }
	else if (document.all) { use_css=true; }
	else if (document.layers) { use_layers=true; }
	// Logic to find position
 	if (use_gebi && document.all) {
		x=AnchorPosition_getPageOffsetLeft(document.all[anchorname]);
		y=AnchorPosition_getPageOffsetTop(document.all[anchorname]);
		}
	else if (use_gebi) {
		var o=document.getElementById(anchorname);
		x=AnchorPosition_getPageOffsetLeft(o);
		y=AnchorPosition_getPageOffsetTop(o);
		}
 	else if (use_css) {
		x=AnchorPosition_getPageOffsetLeft(document.all[anchorname]);
		y=AnchorPosition_getPageOffsetTop(document.all[anchorname]);
		}
	else if (use_layers) {
		var found=0;
		for (var i=0; i<document.anchors.length; i++) {
			if (document.anchors[i].name==anchorname) { found=1; break; }
			}
		if (found==0) {
			coordinates.x=0; coordinates.y=0; return coordinates;
			}
		x=document.anchors[i].x;
		y=document.anchors[i].y;
		}
	else {
		coordinates.x=0; coordinates.y=0; return coordinates;
		}
	coordinates.x=x;
	coordinates.y=y;
	return coordinates;
	}

// getAnchorWindowPosition(anchorname)
//   This function returns an object having .x and .y properties which are the coordinates
//   of the named anchor, relative to the window
function getAnchorWindowPosition(anchorname) {
	var coordinates=getAnchorPosition(anchorname);
	var x=0;
	var y=0;
	if (document.getElementById) {
		if (isNaN(window.screenX)) {
			x=coordinates.x-document.body.scrollLeft+window.screenLeft;
			y=coordinates.y-document.body.scrollTop+window.screenTop;
			}
		else {
			x=coordinates.x+window.screenX+(window.outerWidth-window.innerWidth)-window.pageXOffset;
			y=coordinates.y+window.screenY+(window.outerHeight-24-window.innerHeight)-window.pageYOffset;
			}
		}
	else if (document.all) {
		x=coordinates.x-document.body.scrollLeft+window.screenLeft;
		y=coordinates.y-document.body.scrollTop+window.screenTop;
		}
	else if (document.layers) {
		x=coordinates.x+window.screenX+(window.outerWidth-window.innerWidth)-window.pageXOffset;
		y=coordinates.y+window.screenY+(window.outerHeight-24-window.innerHeight)-window.pageYOffset;
		}
	coordinates.x=x;
	coordinates.y=y;
	return coordinates;
	}

// Functions for IE to get position of an object
function AnchorPosition_getPageOffsetLeft (el) {
	var ol=el.offsetLeft;
	while ((el=el.offsetParent) != null) { ol += el.offsetLeft; }
	return ol;
	}
function AnchorPosition_getWindowOffsetLeft (el) {
	return AnchorPosition_getPageOffsetLeft(el)-document.body.scrollLeft;
	}	
function AnchorPosition_getPageOffsetTop (el) {
	var ot=el.offsetTop;
	while((el=el.offsetParent) != null) { ot += el.offsetTop; }
	return ot;
	}
function AnchorPosition_getWindowOffsetTop (el) {
	return AnchorPosition_getPageOffsetTop(el)-document.body.scrollTop;
	}