Code:

<form>
<table>
<tr>
      <td>1. Polje</td>
</tr>                           
<tr>
      <td><textarea name="1t" cols="20" rows="8"><? echo $neka_vrednost; ?></textarea></td>
</tr>
<tr>
       <td>
       <input type="hidden" value="1" id="theValue" />                                
    <div id="myDiv"> </div>
       <p><a href="javascript:;" onclick="addElement();">Dodaj jos polja</a></p>
       </td>
</tr>
</table>
</form>

Code:

<script language="javascript" type="text/javascript">
function addElement() {
  var ni = document.getElementById('myDiv');
  var numi = document.getElementById('theValue');
  var num = (document.getElementById('theValue').value -1)+ 2;
  numi.value = num;
  
  var newdiv = document.createElement('div');
  
  var divIdName = 'my'+num+'Div';
  
  newdiv.setAttribute('id',divIdName);
  
 
  
  newdiv.innerHTML = '<table width="100%"><tr><td>'+num+'. Pitanje</td></tr><tr><td><textarea name="'+num+'t" cols="20" rows="8"></textarea></td></tr></table>';
  ni.appendChild(newdiv);
}
</script>

Code:

$polje="";
                
    $p=1;
    while($p<20)
    {
        //name atribout textarea
                $polj=$p."t"; 
        
                    
        $polj_=$_POST[$polj];
        
                    
        if($polj_)
        {
            echo $polj_;
        }

                    
        $p++;
    }