Запрос не срабатывает (частный случай)

<?php
class addCredit
{
    function getAddC()
    {
        $error_msg = "<center>Некорректный запрос</center>";
        $fio = $_POST['fio'];
        $sumcred = $_POST['sumcred'];
        $year = $_POST['year'];
        $preview = $_POST['preview'];
        $chcred = $_POST['chcred'];
        $add = $_POST['add'];
        $pereplata = $_POST['sumcred']/100*$_POST['chcred'];
        $temp = " ";
        $tempa = " ";
        $tempb = " ";
        $tempc = " ";
        $tempd = " ";
//------------------------------------------Обработка запросов---------------------------------------------------
        mysql_query("SET NAMES `cp1251`"); //Теперь в таблицах можно писать по русски.
        $query = "SELECT * FROM `srok`";
        $result = mysql_query($query) or die($error_msg);
        while($row = mysql_fetch_array($result)) 
        {
            $select_srok = new classhtml();
            $select_srok->htmlName = "html/credit/option.html";
            $select_srok->content["srok"] = $row['name'];
            $select_srok->content["id"] = $row['id'];
            $tempb .= $select_srok->getresult();
        }
        $query = "SELECT * FROM `chema`";
        $result = mysql_query($query) or die($error_msg);
        while($row = mysql_fetch_array($result)) 
        {
            $select_chema = new classhtml();
            $select_chema->htmlName = "html/credit/option2.html";
            $select_chema->content["chema"] = $row['primesum'];
            $select_chema->content["id"] = $row['id'];
            $select_chema->content["pereplata"] = $row['perepl'];
            $tempc .= $select_chema->getresult();
        }
        if(isset($preview) && (!empty($fio) && !empty($sumcred) && !empty($year) && !empty($chcred)))
        {
            $preview_table = new classhtml();
            $preview_table->htmlName = "html/credit/preview.html";
            $preview_table->content["fio"] = $fio;
            $preview_table->content["sumcred"] = $sumcred;
            $preview_table->content["chcred"] = $chcred;
            $preview_table->content["per"] = $pereplata;
            $tempa .= $preview_table->getresult();
        }
        if(isset($add))
        {
            $this->submitQuery();
        }
        $form_disp = new classhtml();
        $form_disp->htmlName = "html/credit/form.html";
        $form_disp->content["preview_table"] = $tempa;
        $form_disp->content["option"] = $tempb;
        $form_disp->content["option2"] = $tempc;
        $form_disp->content["not"] = $tempd;
        $temp .= $form_disp->getresult();
        return $temp;
    }
    function submitQuery() {
        $fio2 = $_POST['fio'];
        $sumcred2 = $_POST['sumcred'];
        $query = "INSERT INTO `credit` (fio, sumcred) VALUES('".$fio2."', ".$sumcred2.")";
        $result = mysql_query($query) or die(mysql_error());
    }
}
?>