Nepochopitelná chyba?

<?php
include('func.php');
?>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>

<script type="text/javascript">
$(document).ready(function() {
    $('#wait_1').hide();
    $('#drop_1').change(function(){
      $('#wait_1').show();
      $('#result_1').hide();
      $.get("func.php", {
        func: "drop_1",
        drop_var: $('#drop_1').val()
      }, function(response){
        $('#result_1').fadeOut();
        setTimeout("finishAjax('result_1', '"+escape(response)+"')", 400);
      });
        return false;
    });
});

function finishAjax(id, response) {
  $('#wait_1').hide();
  $('#'+id).html(unescape(response));
  $('#'+id).fadeIn();
}
</script>
<?php
....
...
..
$pridat = mysql_query("INSERT INTO nabidka (druh_vozu, vyrobce, model_vozu, doplnujici_nazev, informace_vozu, aktivni) values (
          '".$_POST["druh_vozu"]."',
          '".$_POST["vyrobce"]."',
          '".$_POST["model"]."',
          '".$_POST["doplnujici_nazev"]."',
          '".$_POST["informace_k_vozidlu"]."',
          '".$_POST["aktivni"]."'
        );");

<?php
//**************************************
//     Page load dropdown results     //
//**************************************
function getTierOne()
{
    $result = mysql_query("SELECT DISTINCT id_vyrobce FROM model_vozu ORDER BY nazev") 
    or die(mysql_error());

      while($tier = mysql_fetch_array( $result )) 
  
        {
        $search_sec = MySQL_Query("SELECT * FROM vyrobce WHERE id = ".$tier['id_vyrobce']."");
  while($row = mysql_fetch_array($search_sec)) 
{
           echo '<option value="'.$tier['id_vyrobce'].'">'.$row['nazev'].'</option>';
       }
        }

}

//**************************************
//     First selection results     //
//**************************************
if($_GET['func'] == "drop_1" && isset($_GET['func'])) { 
   drop_1($_GET['drop_var']); 
}

function drop_1($drop_var)
{  
    include_once('../inc/config.php');
    $result = mysql_query("SELECT * FROM model_vozu WHERE id_vyrobce='$drop_var' ORDER BY nazev");
    
    echo 'Model vozu: <select name="model" id="tier_two">
          <option value="" disabled="disabled" selected="selected">Vyberte model vozu</option>';

           while($drop_2 = mysql_fetch_array( $result )) 
            {
              echo '<option value="8">'.$drop_2['nazev'].'</option>';
            }
    
    echo '</select> ';

}
?>