events calendar java script

this http://www.javascriptkit.com/script/...calendar.shtml calendar is great but the script counts number of date beyond the actual date. it does not also take into account the leap month (FEB). Can the developer or any developer here help to collect the problem?

here is some of the code from which i think is the problem

Code:

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var thisDate = 1;                                                        // Tracks current date being written in calendar
var wordMonth = new Array("January","February","March","April","May","June","July","August","September","October","November","December");
var today = new Date();                                                        // Date object to store the current date
var todaysDay = today.getDay() + 1;                                        // Stores the current day number 1-7
var todaysDate = today.getDate();                                        // Stores the current numeric date within the month
var todaysMonth = today.getUTCMonth() + 1;                                // Stores the current month 1-12
var todaysYear = today.getFullYear();                                        // Stores the current year
var monthNum = todaysMonth;                                                // Tracks the current month being displayed
var yearNum = todaysYear;                                                // Tracks the current year being displayed
var firstDate = new Date(String(monthNum)+"/1/"+String(yearNum));        // Object Storing the first day of the current month
var firstDay = firstDate.getUTCDay();                                        // Tracks the day number 1-7 of the first day of the current month
var lastDate = new Date(String(monthNum+1)+"/0/"+String(yearNum));        // Tracks the last date of the current month
var numbDays = 0;
var calendarString = "";
var eastermonth = 0;
var easterday = 0;


function changedate(buttonpressed) {
        if (buttonpressed == "prevyr") yearNum--;
        else if (buttonpressed == "nextyr") yearNum++;
        else if (buttonpressed == "prevmo") monthNum--;
        else if (buttonpressed == "nextmo") monthNum++;
        else  if (buttonpressed == "return") {
                monthNum = todaysMonth;
                yearNum = todaysYear;
        }

        if (monthNum == 0) {
                monthNum = 12;
                yearNum--;
        }
        else if (monthNum == 13) {
                monthNum = 1;
                yearNum++
        }

        lastDate = new Date(String(monthNum+1)+"/0/"+String(yearNum));
        numbDays = lastDate.getDate();
        firstDate = new Date(String(monthNum)+"/1/"+String(yearNum));
        firstDay = firstDate.getDay() + 1;
        createCalendar();
        return;
}


function easter(year) {
// feed in the year it returns the month and day of Easter using two GLOBAL variables: eastermonth and easterday
var a = year % 19;
var b = Math.floor(year/100);
var c = year % 100;
var d = Math.floor(b/4);
var e = b % 4;
var f = Math.floor((b+8) / 25);
var g = Math.floor((b-f+1) / 3);
var h = (19*a + b - d - g + 15) % 30;
var i = Math.floor(c/4);
var j = c % 4;
var k = (32 + 2*e + 2*i - h - j) % 7;
var m = Math.floor((a + 11*h + 22*k) / 451);
var month = Math.floor((h + k - 7*m + 114) / 31);
var day = ((h + k - 7*m +114) % 31) + 1;
eastermonth = month;
easterday = day;
}


function createCalendar() {
        calendarString = '';
        var daycounter = 0;
        calendarString += '<table width="312" border="1" cellpadding="0" cellspacing="1">';
        calendarString += '<tr>';
        calendarString += '<td align=\"center\" valign=\"center\" width=\"40\" height=\"40\"><a href=\"#\" onMouseOver=\"document.PrevYr.src=\'images\/PrevYrOn40x40\.jpg\';\" onMouseOut=\"document.PrevYr.src=\'images\/PrevYrOff40x40\.jpg\';\" onClick=\"changedate(\'prevyr\')\"><img name=\"PrevYr\" src=\"images\/PrevYrOff40x40\.jpg\" width=\"40\" height=\"40\" border=\"0\" alt=\"Prev Yr\"\/><\/a><\/td>';
        calendarString += '<td align=\"center\" valign=\"center\" width=\"40\" height=\"40\"><a href=\"#\" onMouseOver=\"document.PrevMo.src=\'images\/PrevMoOn40x40\.jpg\';\" onMouseOut=\"document.PrevMo.src=\'images\/PrevMoOff40x40\.jpg\';\" onClick=\"changedate(\'prevmo\')\"><img name=\"PrevMo\" src=\"images\/PrevMoOff40x40\.jpg\" width=\"40\" height=\"40\" border=\"0\" alt=\"Prev Mo\"\/><\/a><\/td>';
        calendarString += '<td bgcolor=\"#C8C896\" align=\"center\" valign=\"center\" width=\"128\" height=\"40\" colspan=\"3\"><b>' + wordMonth[monthNum-1] + '&nbsp;&nbsp;' + yearNum + '<\/b><\/td>';
        calendarString += '<td align=\"center\" valign=\"center\" width=\"40\" height=\"40\"><a href=\"#\" onMouseOver=\"document.NextMo.src=\'images\/NextMoOn40x40\.jpg\';\" onMouseOut=\"document.NextMo.src=\'images\/NextMoOff40x40\.jpg\';\" onClick=\"changedate(\'nextmo\')\"><img name=\"NextMo\" src=\"images\/NextMoOff40x40\.jpg\" width=\"40\" height=\"40\" border=\"0\" alt=\"Next Mo\"\/><\/a><\/td>';
        calendarString += '<td align=\"center\" valign=\"center\" width=\"40\" height=\"40\"><a href=\"#\" onMouseOver=\"document.NextYr.src=\'images\/NextYrOn40x40\.jpg\';\" onMouseOut=\"document.NextYr.src=\'images\/NextYrOff40x40\.jpg\';\" onClick=\"changedate(\'nextyr\')\"><img name=\"NextYr\" src=\"images\/NextYrOff40x40\.jpg\" width=\"40\" height=\"40\" border=\"0\" alt=\"Next Yr\"\/><\/a><\/td>';
        calendarString += '<\/tr>';
        calendarString += '<tr>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Sun<\/td>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Mon<\/td>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Tue<\/td>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Wed<\/td>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Thu<\/td>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Fri<\/td>';
        calendarString += '<td bgcolor=\"#DDDDDD\" align=\"center\" valign=\"center\" width=\"40\" height=\"22\">Sat<\/td>';
        calendarString += '<\/tr>';

        thisDate == 1;

        for (var i = 1; i <= 6; i++) {
                calendarString += '<tr>';
                for (var x = 1; x <= 7; x++) {
                        daycounter = (thisDate - firstDay)+1;
                        thisDate++;
                        if ((daycounter > numbDays) || (daycounter < 1)) {
                                calendarString += '<td align=\"center\" bgcolor=\"#888888\" height=\"30\" width=\"40\">&nbsp;<\/td>';
                        } else {
                                if (checkevents(daycounter,monthNum,yearNum,i,x) || ((todaysDay == x) && (todaysDate == daycounter) && (todaysMonth == monthNum))){
                                        if ((todaysDay == x) && (todaysDate == daycounter) && (todaysMonth == monthNum)) {
                                                calendarString += '<td align=\"center\" bgcolor=\"#AAFFAA\" height=\"30\" width=\"40\"><a href=\"javascript:showevents(' + daycounter + ',' + monthNum + ',' + yearNum + ',' + i + ',' + x + ')\">' + daycounter + '<\/a><\/td>';
                                        }
                                        else        calendarString += '<td align=\"center\" bgcolor=\"#FFFFC8\" height=\"30\" width=\"40\"><a href=\"javascript:showevents(' + daycounter + ',' + monthNum + ',' + yearNum + ',' + i + ',' + x + ')\">' + daycounter + '<\/a><\/td>';
                                } else {
                                        calendarString += '<td align=\"center\" bgcolor=\"#DDFFFF\" height=\"30\" width=\"40\">' + daycounter + '<\/td>';
                                }
                        }
                }
                calendarString += '<\/tr>';
        }

        calendarString += '<tr><td colspan=\"7\" nowrap align=\"center\" valign=\"center\" bgcolor=\"#C8C896\" width=\"280\" height=\"22\"><a href=\"javascript:changedate(\'return\')\"><b>Show Current Date<\/b><\/a><\/td><\/tr><\/table>';

        var object=document.getElementById('calendar');
        object.innerHTML= calendarString;
        thisDate = 1;
}

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You might do better by looking at Fast Cal developed by our very own Beverleyh.