function calDate(str, objId) {
    if (str != '') {
        //alert(str);
        dArr = str.split('/');
        //alert("len=" + dArr.length);
        //alert("dArr[0]= " + dArr[0] + ", dArr[1]= " + dArr[1] + ", dArr[2]=" + dArr[2]);
        day = dArr[0];
        month = dArr[1];
        year = dArr[2];
        if ((day != '__') & (month != '__') & (year != '____')) {
            iDay = parseInt(day, 10);
            iMonth = parseInt(month, 10);
            iYear = parseInt(year, 10);
            //alert("A : " + iDay + '/' + iMonth + '/' + iYear);
            var myDate = new Date(iYear, iMonth-1, iDay);            
            //alert("myDate=" + myDate);
            var newDate = myDate.addTime(Date.DAY, 1);            
            //alert("newDate=" + newDate);
            document.getElementById(objId).value = dateFormat(newDate, "dd/mm/yyyy");
        }
    }
}

/*
* Date Format 1.2.3
* (c) 2007-2009 Steven Levithan <stevenlevithan.com>
* MIT license
*
* Includes enhancements by Scott Trenda <scott.trenda.net>
* and Kris Kowal <cixar.com/~kris.kowal/>
*
* Accepts a date, a mask, or a date and a mask.
* Returns a formatted version of the given date.
* The date defaults to the current date/time.
* The mask defaults to dateFormat.masks.default.
*/

var dateFormat = function() {
    var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function(val, len) {
		    val = String(val);
		    len = len || 2;
		    while (val.length < len) val = "0" + val;
		    return val;
		};

    // Regexes and supporting functions are cached through closure
    return function(date, mask, utc) {
        var dF = dateFormat;

        // You can't provide utc if you skip other args (use the "UTC:" mask prefix)
        if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
            mask = date;
            date = undefined;
        }

        // Passing date through Date applies Date.parse, if necessary
        date = date ? new Date(date) : new Date;
        if (isNaN(date)) throw SyntaxError("invalid date");

        mask = String(dF.masks[mask] || mask || dF.masks["default"]);

        // Allow setting the utc argument via the mask
        if (mask.slice(0, 4) == "UTC:") {
            mask = mask.slice(4);
            utc = true;
        }

        var _ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
			    d: d,
			    dd: pad(d),
			    ddd: dF.i18n.dayNames[D],
			    dddd: dF.i18n.dayNames[D + 7],
			    m: m + 1,
			    mm: pad(m + 1),
			    mmm: dF.i18n.monthNames[m],
			    mmmm: dF.i18n.monthNames[m + 12],
			    yy: String(y).slice(2),
			    yyyy: y,
			    h: H % 12 || 12,
			    hh: pad(H % 12 || 12),
			    H: H,
			    HH: pad(H),
			    M: M,
			    MM: pad(M),
			    s: s,
			    ss: pad(s),
			    l: pad(L, 3),
			    L: pad(L > 99 ? Math.round(L / 10) : L),
			    t: H < 12 ? "a" : "p",
			    tt: H < 12 ? "am" : "pm",
			    T: H < 12 ? "A" : "P",
			    TT: H < 12 ? "AM" : "PM",
			    Z: utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
			    o: (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
			    S: ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

        return mask.replace(token, function($0) {
            return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
        });
    };
} ();

// Some common format strings
dateFormat.masks = {
    "default": "ddd mmm dd yyyy HH:MM:ss",
    shortDate: "m/d/yy",
    mediumDate: "mmm d, yyyy",
    longDate: "mmmm d, yyyy",
    fullDate: "dddd, mmmm d, yyyy",
    shortTime: "h:MM TT",
    mediumTime: "h:MM:ss TT",
    longTime: "h:MM:ss TT Z",
    isoDate: "yyyy-mm-dd",
    isoTime: "HH:MM:ss",
    isoDateTime: "yyyy-mm-dd'T'HH:MM:ss",
    isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
    dayNames: [
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
	],
    monthNames: [
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
	]
};

// For convenience...
Date.prototype.format = function(mask, utc) {
    return dateFormat(this, mask, utc);
};

/**
* Creates and returns a new Date instance with the exact same date value as the called instance.
* Dates are copied and passed by reference, so if a copied date variable is modified later, the original 
* variable will also be changed.  When the intention is to create a new variable that will not 
* modify the original instance, you should create a clone.
*
* Example of correctly cloning a date:
* <pre><code>
//wrong way:
var orig = new Date('10/1/2006');
var copy = orig;
copy.setDate(5);
document.write(orig);  //returns 'Thu Oct 05 2006'!

//correct way:
var orig = new Date('10/1/2006');
var copy = orig.clone();
copy.setDate(5);
document.write(orig);  //returns 'Thu Oct 01 2006'
</code></pre>
* @return {Date} The new Date instance
*/
Date.prototype.clone = function() {
    return new Date(this.getTime());
};


/** Date interval constant @static @type String */
Date.MILLI = "ms";
/** Date interval constant @static @type String */
Date.SECOND = "s";
/** Date interval constant @static @type String */
Date.MINUTE = "mi";
/** Date interval constant @static @type String */
Date.HOUR = "h";
/** Date interval constant @static @type String */
Date.DAY = "d";
/** Date interval constant @static @type String */
Date.MONTH = "mo";
/** Date interval constant @static @type String */
Date.YEAR = "y";

/** 
* Provides a convenient method of performing basic date arithmetic.  This method
* does not modify the Date instance being called - it creates and returns
* a new Date instance containing the resulting date value.
*
* Examples:
* <pre><code>
//Basic usage:
var dt = new Date('10/29/2006').add(Date.DAY, 5);
document.write(dt); //returns 'Fri Oct 06 2006 00:00:00'

//Negative values will subtract correctly:
var dt2 = new Date('10/1/2006').add(Date.DAY, -5);
document.write(dt2); //returns 'Tue Sep 26 2006 00:00:00'

//You can even chain several calls together in one line!
var dt3 = new Date('10/1/2006').add(Date.DAY, 5).add(Date.HOUR, 8).add(Date.MINUTE, -30);
document.write(dt3); //returns 'Fri Oct 06 2006 07:30:00'
</code></pre>
*
* @param {String} interval   A valid date interval enum value
* @param {Number} value      The amount to add to the current date
* @return {Date} The new Date instance
*/
Date.prototype.addTime = function(interval, value) {
    var d = this.clone();
    if (!interval || value === 0) return d;
    switch (interval.toLowerCase()) {
        case Date.MILLI:
            d.setMilliseconds(this.getMilliseconds() + value);
            break;
        case Date.SECOND:
            d.setSeconds(this.getSeconds() + value);
            break;
        case Date.MINUTE:
            d.setMinutes(this.getMinutes() + value);
            break;
        case Date.HOUR:
            d.setHours(this.getHours() + value);
            break;
        case Date.DAY:
            d.setDate(this.getDate() + value);
            break;
        case Date.MONTH:
            var day = this.getDate();
            if (day > 28) {
                day = Math.min(day, this.getFirstDateOfMonth().add('mo', value).getLastDateOfMonth().getDate());
            }
            d.setDate(day);
            d.setMonth(this.getMonth() + value);
            break;
        case Date.YEAR:
            d.setFullYear(this.getFullYear() + value);
            break;
    }
    return d;
};