special filed QuickForm

i need to handle a special field .. in database record is a TEXT my field must save "serialize($array)" and this filed must shown as a list of "input text" one for the "key" and one for the "value" this code... read and show where i want to do.. but i can't save.. anyone can help me? please.. [code] <?php require_once('HTML/QuickForm/textarea.php'); class HTML_QuickForm_arrayxot extends HTML_QuickForm_textarea{ /**

    * Class constructor
    *
    * @param   string  Htmlarea name/id
    * @param   string  Htmlarea label
    * @param   array   Options for htmlarea
    * @param   string  Attributes for the textarea
    * @access  public
    * @return  void
    */
   function HTML_QuickForm_arrayxot($elementName=null, $elementLabel=null, $options=array(), $attributes=null)

{

       HTML_QuickForm_element::HTML_QuickForm_element($elementName, $elementLabel, $attributes);
       $this->_persistantFreeze = true;
       $this->_type = 'arrayxot';

       if (is_array($options)) {
           foreach ($options as $k => $v) {
               if (isset($this->{"_$k"}) && method_exists($this, "set$k")) {
                   $this->{"set$k"}($v);
               }
           }
       }

} function toHtml(){ $nome=$this->getName();

       if ($this->_flagFrozen) {
           return $this->getFrozenHtml();

//return serialize(parent::toHtml()); /*

    */
       } else {

$html=""; if(strlen( $this->getValue() )>5){

      $tmp_arr=unserialize( $this->getValue() );

while (list($key, $value) = each ($tmp_arr)) {

       //echo "Chiave: $key; Valore: $value<br>\n";
    $html.= '<input type="text" name="'.$nome.'_name[]" value="'.$key.'">'." => ".'<input type="text" name="'.$nome.'_value[]" value="'.$value.'"><br>';

}//end while }//end if

      for($iij=0;$iij<3;$iij++){
       $html.= '<input type="text" name="'.$nome.'_name[]" value="">'." => ".'<input type="text" name="'.$nome.'_value[]" value=""><br>';

}//end for return $html; } } function getFrozenHtml(){

     $nome=$this->getName();

$arr_tmp=array();

     //tbl_input_attrs_name[]
    for($ij=0;$ij<count($_REQUEST[$nome."_name"]);$ij++){
        $name_tmp=$_REQUEST[$nome."_name"][$ij];
        $value_tmp=$_REQUEST[$nome."_value"][$ij];
        $arr_tmp[$name_tmp]=$value_tmp;
    }
    if($arr_tmp!=array()){
     $txt=serialize($arr_tmp);
     if(strlen($txt)<25){
       $txt="";
     }
     if($txt=='[a:1:{s:0:"";s:0:"";}]'){
       $txt="";
     }
    }
    return $txt;

} } [/code]