About CKEDITOR.replace problem!

step 1: I use table.insertRow().insertCell() will create a "DayContent_2" textarea input then i use CKEDITOR.replace( 'DayContent_2' ) is work !

step 2: I table.deleteRow the step 1's "DayContent_2" textarea input !

step 3: I use table.insertRow().insertCell() create "DayContent_2" textarea input again, but CKEDITOR.replace( 'DayContent_2' ) isn't work ! it alert "undefined" but the "DayContent_2" textarea input is exist !

My English isn't very good and help me please , thanks a lot!

Create a "DayContent_X" textarea input javascript code

function createTextArea(){
   
   var mytable = $("dayday"); 
   var mycount = mytable.rows.length;
   var row = mytable.insertRow();
   
   var td1=row.insertCell();
   td1.className='wbg';
   
   var tmp1='<textarea name="DayContent_'+mycount+'" style="width:100%;" rows="8" id="DayContent_'+mycount+'" ></textarea>';
   td1.innerHTML = tmp1;

   try
   {
      CKEDITOR.replace( 'DayContent_'+mycount );
   }
   catch(e)
   {
   
      alert(e.description);
   }
   return true;
}

Delete a "DayContent_X" textarea input javascript code

function deleteTextarea()
{
   var myta=$("dayday");
   var mycount = myta.rows.length;

   if(myta.rows.length-1>1)
   {
      myta.deleteRow(mycount-1);
   }
   else
   {
      alert("The last one!");
      return;
   }
}

dayday table html code

<table width="100%" border="0" cellpadding="2" cellspacing="1" bgcolor="#a0c5e9" id="dayday" name="dayday">
  <tr>
    <td bgcolor="#FFFFFF"><input  type="button" class="Button1"  onclick="createTextArea()" value="insert" />
    <input  type="button" class="Button1" onclick="deleteTextarea()"   value="delete" /></td>
  </tr>
  <tr>
    <td bgcolor="#FFFFFF"><textarea name="DayContent_1"  rows="8"   id="DayContent_1" style="width:100%;"></textarea></td>
  </tr>
</table>