Calendario en php

Te remito esta pregunta que me hicieron, ya que aparentemente confundieron mis categorías, y me preguntaron sobre php de lo que no entiendo nada!
Te agradezco tu molestia.
Acá esta la pregunta original:
Hola! Necesito ayuda poke toy aciendo 1 aplicacion en php pero necesito 1 calensario en el que pueda señalar dias y poner notas. Me baje 1 en java script pero las variables se guardan en coockies y no se como hacer e se guarde los dias que tienen algo markado en mis tablas para luego sacar esos dias en 1 informe, te mando el código para ke le exes 1 vistazo:
<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Greg Quilop ([email protected]) -->
<!-- Web Site: http://www.queriousdesigns.com -->
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
<!-- Begin
var mo = "";
var year = "";
var currentmonth = today.getMonth();
var currentyear = today.getFullYear();
//cookies are not found
if(document.cookie == "") {
mo = today.getMonth();
year = today.getFullYear();
}
else {
mo = getCookie('whichmonth');
//correct cookie is NOT set
if(mo == null) {
mo = today.getMonth();
year = today.getFullYear();
//alert number of reminders to user
alertReminders();
}
//correct cookie is set
else {
mo = getCookie('whichmonth');
year = getCookie('whichyear');
}
}
//set a session cookie
setCookie('whichmonth',mo);
setCookie('whichyear', year);
//backup one month and refresh
function backup() {
//check for a new year being set
if(mo > 0) {
mo--;
} else {
mo = 11;
//check for 19**
if(year == 2000) {
year = 1999;
} else if(year <= 1999) {
syear = year.substring(2,year.length);
syear--;
year = "19" + syear;
Number(year);
}
else {
year--;
}
}
setCookie('whichmonth',mo);
setCookie('whichyear', year);
//check for open child windows and close.
if(child && !child.closed) {
child.close();
}
document.location="calendar.html";
}
//go forward one month and refresh
function stepup() {
//check for a new year being set
if(mo < 11) {
mo++;
}
else {
mo = 0;
year++;
}
setCookie('whichmonth',mo);
setCookie('whichyear', year);
//check for open child windows and close.
if(child && !child.closed) {
child.close();
}
document.location="calendar.html";
}
//first starting day of month
var first = months[mo] + " 01, " + year;
firstday = new Date(first);
startday = firstday.getDay();
//variable for day count
var count = 1;
//variables for leap year
var factor = startday - 1;
var endday = parseInt(monthlen[mo]) + factor;
var calbg = "#666666";
var calwidth = "80%";
var twidth = "14%";
var theight = "70";
var monthbg = "#000000";
var monfam = "verdana,arial,helvetica";
var monsize = "3"
var moncol = "#ffffff"
var weekbg = "#eeeeee";
var weekfam = "verdana,arial,helvetica";
var weeksize = "2";
var weekcol = "#ff0000";
var daybg = "#eeeeee";
var dayfam = "verdana,arial,helvetica";
var daysize = "1";
var daycol = "#000000";
var sdaycol = "#ff0000";
var calendar = "";
calendar = "<table bgcolor='" + calbg + "' width='" + calwidth + "' border='0' cellpadding='1' cellspacing='0'>";
calendar += "<tr>";
calendar += "<td align='center'>";
<!-- Month Starts Here -->
calendar += "<table width='100%' border='0' cellpadding='3' cellspacing='0'>";
calendar += "<tr>";
calendar += "<td align='center'> <a href='javascript:backup();'><font color='#ffffff'><b><<</b></font></a> </td>";
calendar += "<td width='100%' bgcolor='" + monthbg + "' align='center'><font face='" + monfam + "' size=" + monsize + " color=" + moncol + "><b>";
calendar += "<a href='javascript://' onclick='open_all(\"all_reminders.html\");'><font color='#ffffff'>" + months[mo] + ", " + year + "</font></a>";
calendar += "</b></font></td>";
calendar += "<td align='center'> <a href='javascript:stepup();'><font color='#ffffff'><b>>></b></font></a> </td>";
calendar += "</tr>";
calendar += "</table>";
<!-- Month Ends Here -->
calendar += "</td>";
calendar += "</tr>";
calendar += "<tr>";
calendar += "<td align='center'>";
<!-- Week Starts Here -->
calendar += "<table width='100%' border='0' cellpadding='3' cellspacing='0'>";
calendar += "<tr>";
for(i = 0; i < 7; i++) {
calendar += "<td width='" + twidth + "' bgcolor='" + weekbg + "' align='center' valign='middle'><font face='" + weekfam + "' size=" + weeksize + " color=" + weekcol + "><b>";
calendar += days;
calendar += "</b></font></td>";
}
calendar += "</tr>";
calendar += "</table>";
<!-- Week Ends Here -->
calendar += "</td>";
calendar += "</tr>";
calendar += "<tr>";
calendar += "<td align='center'>";
<!-- Day Starts Here -->
calendar += "<table width='100%' border='0' cellpadding='2' cellspacing='1'>";
calendar += "<tr>";
if(startday > 0) {
for(empty = 0; empty < startday; empty++) {
calendar += "<td width='" + twidth + "' height='" + theight + "'> </td>";
}
}
for(i = startday; i <= endday; i++) {
if( (i % 7) == 0) {
calendar += "</tr><tr>";
}
//keep highlight info on the current month and day
if( (i - (startday - 1)) == dt && currentmonth == mo && currentyear == year) {
calendar += "<td width='" + twidth + "' height='" + theight + "' bgcolor='" + daybg + "' align='right' valign='top'><font face='" + dayfam + "' size=" + daysize + "><b>";
calendar += "<a href='javascript://' onclick=javascript:open_window('day_scheduler.html?" + months[mo] + "&" + count + "',300,350,0,1);><font color=" + sdaycol + ">" + count +...