loadbarang.php

<?php
mysql_connect('localhost','root','');
mysql_select_db('ta_barang');

$kd_barang=isset($_GET['kd_barang'])?(int)trim($_GET['kd_barang']):0;
$option='<option value="0">-- Pilih --</option>';
if($kd_barang>0) {
  $sql=mysql_query('SELECT * FROM tb_barang WHERE kd_kategori="'.$kd_barang.'"');
  while($rec=mysql_fetch_array($sql)) {
    $option.='<option value="'.$rec['kd_barang'].'">'.$rec['nama_barang'].' - '.$rec['type_barang'].'</option>';
  }
}
echo $option;
?>