Maaf mau nanya salahnya dimana ya?

<?php
include "koneksi.php";

$halaman= $_POST['halaman'];
$no = $_POST['no'];
$regional = $_POST['regional'];
$osm = $_POST['osm'];
$plan_no = $_POST['plan_no'];
$lokasi = $_POST['lokasi'];
$status = $_POST['status'];


		$simpan=mysql_query("insert into tbl_callcenter(no,regional,osm,plan_no,lokasi,status) values('$no','$regional','$osm','$plan_no','$lokasi','$status')");

			if($simpan){
				?>
				<script type="text/javascript">
					alert("Tambah ROC Berhasil");
					document.location="<?php echo $halaman;?>v_roc_woc.php";
				</script>
				<?php
			}else{
				?>
				<script type="text/javascript">
					alert("Tambah ROC Gagal");
					history.go(-1);
				</script>
				<?php
			}
		}
?>