Issue with datepicker
<p>I am using a sample program that contains three text fields, upon clicking on them it will displays a date picker and once you choose a date that date will be displayed in the filed. It is working fine for first field but next two fields are not working i.e, those are displaying the date picker but not setting the picked value to the filed. Here is my sample code.</p>

<pre><code>  &lt;script language="javaScript" type="text/javascript" src="calendar.js"&gt;&lt;/script&gt;
  &lt;link href="style/calendar.css" rel="stylesheet" type="text/css"&gt;
 ........
 &lt;table id="calenderTable"&gt;
   &lt;tbody id="calenderTableHead"&gt;
     &lt;tr&gt;
       &lt;td colspan="4" align="center"&gt;
     &lt;select onChange="showCalenderBody(createCalender(document.getElementById('selectYear').value,
                                               this.selectedIndex, false));"
                                                        id="selectMonth"&gt;
              &lt;option value="0"&gt;Jan&lt;/option&gt;
              &lt;option value="1"&gt;Feb&lt;/option&gt;
              &lt;option value="2"&gt;Mar&lt;/option&gt;
              &lt;option value="3"&gt;Apr&lt;/option&gt;
              &lt;option value="4"&gt;May&lt;/option&gt;
              &lt;option value="5"&gt;Jun&lt;/option&gt;
              &lt;option value="6"&gt;Jul&lt;/option&gt;
              &lt;option value="7"&gt;Aug&lt;/option&gt;
              &lt;option value="8"&gt;Sep&lt;/option&gt;
              &lt;option value="9"&gt;Oct&lt;/option&gt;
              &lt;option value="10"&gt;Nov&lt;/option&gt;
              &lt;option value="11"&gt;Dec&lt;/option&gt;
          &lt;/select&gt;
        &lt;/td&gt;
        &lt;td colspan="2" align="center"&gt;
    &lt;select onChange="showCalenderBody(createCalender(this.value,
      document.getElementById('selectMonth').selectedIndex, false));"
          id="selectYear"&gt;
    &lt;/select&gt;
        &lt;/td&gt;
       &lt;td align="center"&gt;
    &lt;a href="#" onClick="closeCalender();"&gt;
          &lt;font color="#003333" size="+1"&gt;X&lt;/font&gt;
        &lt;/a&gt;
   &lt;/td&gt;
&lt;/tr&gt;
   &lt;/tbody&gt;
   &lt;tbody id="calenderTableDays"&gt;
     &lt;tr style=""&gt;
       &lt;td&gt;Sun&lt;/td&gt;&lt;td&gt;Mon&lt;/td&gt;&lt;td&gt;Tue&lt;/td&gt;&lt;td&gt;Wed&lt;/td&gt;
       &lt;td&gt;Thu&lt;/td&gt;&lt;td&gt;Fri&lt;/td&gt;&lt;td&gt;Sat&lt;/td&gt;
     &lt;/tr&gt;
   &lt;/tbody&gt;
   &lt;tbody id="calender"&gt;&lt;/tbody&gt;
&lt;/table&gt;
</code></pre>

<p>
       
           
       </p>

<p><strong>calender.js</strong></p>

<pre><code>  // Array of max days in month in a year and in a leap year
 monthMaxDays   = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
 monthMaxDaysLeap= [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
 hideSelectTags = [];

 function getRealYear(dateObj) 
 {
return (dateObj.getYear() % 100) + (((dateObj.getYear() % 100) &lt; 39) ? 2000 : 1900);
}

function getDaysPerMonth(month, year)
{
/* 
Check for leap year. These are some conditions to check year is leap year or not...
1.Years evenly divisible by four are normally leap years, except for... 
2.Years also evenly divisible by 100 are not leap years, except for... 
3.Years also evenly divisible by 400 are leap years. 
*/
if ((year % 4) == 0)
{
    if ((year % 100) == 0 &amp;&amp; (year % 400) != 0)
        return monthMaxDays[month];

    return monthMaxDaysLeap[month];
}
else
    return monthMaxDays[month];
 }

 function createCalender(year, month, day)
 {
 // current Date
var curDate = new Date();
var curDay = curDate.getDate();
var curMonth = curDate.getMonth();
var curYear = getRealYear(curDate)

 // if a date already exists, we calculate some values here
if (!year)
{
    var year = curYear;
    var month = curMonth;
}

var yearFound = 0;
for (var i=0; i&lt;document.getElementById('selectYear').options.length; i++)
{
    if (document.getElementById('selectYear').options[i].value == year)
    {
        document.getElementById('selectYear').selectedIndex = i;
        yearFound = true;
        break;
    }
}
if (!yearFound)
{
    document.getElementById('selectYear').selectedIndex = 0;
    year = document.getElementById('selectYear').options[0].value;      
}
document.getElementById('selectMonth').selectedIndex = month;

 // first day of the month.
var fristDayOfMonthObj = new Date(year, month, 1);
var firstDayOfMonth = fristDayOfMonthObj.getDay();

continu     = true;
firstRow    = true;
var x   = 0;
var d   = 0;
var trs = []
var ti = 0;
while (d &lt;= getDaysPerMonth(month, year))
{
    if (firstRow)
    {
        trs[ti] = document.createElement("TR");
        if (firstDayOfMonth &gt; 0)
        {
            while (x &lt; firstDayOfMonth)
            {
                trs[ti].appendChild(document.createElement("TD"));
                x++;
            }
        }
        firstRow = false;
        var d = 1;
    }
    if (x % 7 == 0)
    {
        ti++;
        trs[ti] = document.createElement("TR");
    }
    if (day &amp;&amp; d == day)
    {
        var setID = 'calenderChoosenDay';
        var styleClass = 'choosenDay';
        var setTitle = 'this day is currently selected';
    }
    else if (d == curDay &amp;&amp; month == curMonth &amp;&amp; year == curYear)
    {
        var setID = 'calenderToDay';
        var styleClass = 'toDay';
        var setTitle = 'this day today';
    }
    else
    {
        var setID = false;
        var styleClass = 'normalDay';
        var setTitle = false;
    }
    var td = document.createElement("TD");
    td.className = styleClass;
    if (setID)
    {
        td.id = setID;
    }
    if (setTitle)
    {
        td.title = setTitle;
    }
    td.onmouseover = new Function('highLiteDay(this)');
    td.onmouseout = new Function('deHighLiteDay(this)');
    if (targetEl)
        td.onclick = new Function('pickDate('+year+', '+month+', '+d+')');
    else
        td.style.cursor = 'default';
    td.appendChild(document.createTextNode(d));
    trs[ti].appendChild(td);
    x++;
    d++;
}
return trs;
 }

 function showCalender(elPos, tgtEl)
{
targetEl = false;

if (document.getElementById(tgtEl))
{
    targetEl = document.getElementById(tgtEl);
}
else
{
    if (document.forms[0].elements[tgtEl])
    {
        targetEl = document.forms[0].elements[tgtEl];
    }
}
var calTable = document.getElementById('calenderTable');

var positions = [0,0];
var positions = getParentOffset(elPos, positions);  
calTable.style.left = positions[0]+'px';        
calTable.style.top = positions[1]+'px';         

calTable.style.display='block';

var matchDate = new RegExp('^([0-9]{2})-([0-9]{2})-([0-9]{4})$');
var m = matchDate.exec(targetEl.value);
if (m == null)
{
    trs = createCalender(false, false, false);
    showCalenderBody(trs);
}
else
{
    if (m[1].substr(0, 1) == 0)
        m[1] = m[1].substr(1, 1);
    if (m[2].substr(0, 1) == 0)
        m[2] = m[2].substr(1, 1);
    m[2] = m[2] - 1;
    trs = createCalender(m[3], m[2], m[1]);
    showCalenderBody(trs);
}

hideSelect(document.body, 1);
 }
  function showCalenderBody(trs)
 {
var calTBody = document.getElementById('calender');
while (calTBody.childNodes[0])
{
    calTBody.removeChild(calTBody.childNodes[0]);
}
for (var i in trs)
{
    calTBody.appendChild(trs[i]);
}
}
function setYears(sy, ey)
{
 // current Date
var curDate = new Date();
var curYear = getRealYear(curDate);
if (sy)
    startYear = curYear;
if (ey)
    endYear = curYear;
document.getElementById('selectYear').options.length = 0;
var j = 0;
for (y=ey; y&gt;=sy; y--)
{
    document.getElementById('selectYear')[j++] = new Option(y, y);
}  
 }
 function hideSelect(el, superTotal)
 {
if (superTotal &gt;= 100)
{
    return;
}

var totalChilds = el.childNodes.length;
for (var c=0; c&lt;totalChilds; c++)
{
    var thisTag = el.childNodes[c];
    if (thisTag.tagName == 'SELECT')
    {
        if (thisTag.id != 'selectMonth' &amp;&amp; thisTag.id != 'selectYear')
        {
            var calenderEl = document.getElementById('calenderTable');
            var positions = [0,0];
            var positions = getParentOffset(thisTag, positions);    // nieuw
            var thisLeft    = positions[0];
            var thisRight   = positions[0] + thisTag.offsetWidth;
            var thisTop = positions[1];
            var thisBottom  = positions[1] + thisTag.offsetHeight;
            var calLeft = calenderEl.offsetLeft;
            var calRight    = calenderEl.offsetLeft + calenderEl.offsetWidth;
            var calTop  = calenderEl.offsetTop;
            var calBottom   = calenderEl.offsetTop + calenderEl.offsetHeight;

            if (
                (
                    /* check if it overlaps horizontally */
                    (thisLeft &gt;= calLeft &amp;&amp; thisLeft &lt;= calRight)
                        ||
                    (thisRight &lt;= calRight &amp;&amp; thisRight &gt;= calLeft)
                        ||
                    (thisLeft &lt;= calLeft &amp;&amp; thisRight &gt;= calRight)
                )
                    &amp;&amp;
                (
                    /* check if it overlaps vertically */
                    (thisTop &gt;= calTop &amp;&amp; thisTop &lt;= calBottom)
                        ||
                    (thisBottom &lt;= calBottom &amp;&amp; thisBottom &gt;= calTop)
                        ||
                    (thisTop &lt;= calTop &amp;&amp; thisBottom &gt;= calBottom)
                )
            )
            {
                hideSelectTags[hideSelectTags.length] = thisTag;
                thisTag.style.display = 'none';
            }
        }

    }
    else if(thisTag.childNodes.length &gt; 0)
    {
        hideSelect(thisTag, (superTotal+1));
    }
}
 }
function closeCalender()
  {
        for (var i=0; i&lt;hideSelectTags.length; i++)
{
    hideSelectTags[i].style.display = 'block';
}
hideSelectTags.length = 0;
document.getElementById('calenderTable').style.display='none';
}
 function highLiteDay(el)
{
el.className = 'hlDay'; 
}
function deHighLiteDay(el)
{
if (el.id == 'calenderToDay')
    el.className = 'toDay';
else if (el.id == 'calenderChoosenDay')
    el.className = 'choosenDay';
else
    el.className = 'normalDay';
}
function pickDate(year, month, day)
{ 
month++;
day = day &lt; 10 ? '0'+day : day;
month   = month &lt; 10 ? '0'+month : month;
if (!targetEl)
{
    alert('target for date is not set yet');
}
else
{
    targetEl.value= day+'-'+month+'-'+year;
    closeCalender();
  }  
     }
   function getParentOffset(el, positions)
 {
positions[0] += el.offsetLeft;
positions[1] += el.offsetTop;
   if (el.offsetParent)
         positions = getParentOffset(el.offsetParent, positions);
return positions;
 }
</code></pre>

<p>What is the problem with my code or the picker??</p>
