gini lho gan

<!--index.php-->
<div class="koding">
<!--Menuju ke proses_simpan.php-->
<form name="form_kontrak_kerja" method="post" action="proses_simpan.php" class="form-horizontal">
<div class="form-group">
    <label for="no_kontrak" class="col-sm-2 control-label">No Kontrak</label>
    <div class="col-sm-3">
        <input name="no_kontrak" type="text" class="form-control" placeholder="Isikan No Kontrak di Sini" />
    </div>
</div>

<div class="form-group">
    <label for="mitra" class="col-sm-2 control-label">Mitra</label>
    <div class="col-sm-3">
        <input name="mitra" type="text" class="form-control" placeholder="Isikan Mitra di Sini" />
    </div>
</div>

<div class="form-group">
    <label for="upload_pdf" class="col-sm-2 control-label">Upload PDF</label>
    <div class="col-sm-3">
        <input name="upload_pdf" type="file" />
    </div>
</div>

<div class="form-group">
    <div class="col-sm-offset-2 col-sm-10">
        <button type="submit" name="submit" class="btn btn-primary"><span class="glyphicon glyphicon-floppy-disk"></span> Simpan</button>      <button type="reset" name="reset" class="btn btn-default"><span class="glyphicon glyphicon-remove"></span> Batal</button>
    </div>
</div>
</form>
</div>

<!--proses_simpan.php-->
<?php
include 'koneksi.php';

$no_kontrak = $_POST['no_kontrak'];
$mitra = $_POST['mitra'];
//$upload_pdf = $_POST['upload_pdf'];

if(!empty($_FILES["upload_pdf"]["tmp_name"]))
{
    $jenis_gambar = ($_FILES['upload_pdf']['type']);
    if($jenis_gambar=="pdf") //nilainya bukan pdf
    {
        $pdf = basename($_FILES['upload_pdf']['name']);
        if(move_uploaded_file($_FILES['upload_pdf']['tmp_name'], "pdf/".$pdf))
        {
            $simpan = mysql_query("INSERT INTO surat_kontrak_kerja(No_kontrak,Mitra,Upload)VALUES('$no_kontrak','$mitra','$pdf')");
            ?>
            <script language="javascript">
                location.href="index.php";
            </script>
            <?php
die('success');
        }else{ die('gak bisa di move'); }
    }else{
       die('jenisnya gk dikenali ='.$jenis_gambar );
    }
}else{
    die('ngak ada yg di upload');
}
?>