Filter data dengan combobox

Saya bikin combobox untuk sortir data, tapi masih belum bisa di gunakan combonya padahal urlnya sudah sesuai, mohon bantuan nya teman2....

<form method='get'>
<?php
if($_SESSION['level']=="Top_Administrator"){
?>
<div class="col-xs-1"  align='center'>
<label>Perumahan </label>
</div>
<div class="col-xs-2" align="center">
<select name='id_cabang' class="form-control">
	<option value=''>Pilih Cabang Perusahaan</option>
<?php
include "config/koneksi.php";
$r=mysql_query("select * from cabang order by nama_perumahan");
while($w=mysql_fetch_array($r)){
if(@$_GET['id_cabang']=="$w[id_cabang]"){
$sel="selected";}else{$sel="";
}
echo"<option value='$w[id_cabang]' $sel>$w[nama_perumahan]</option>";
}
?>
<select>
</div>

<?php
}elseif($_SESSION['level']=="Admin"){
echo"<input type='hidden' name='id_cabang' value='$_SESSION[id_cabang]' >";
}
?>

<div class="col-xs-1"  align='center'>
<label>Status </label>
</div>

<div class="col-xs-2" align="center">
<select name='id_status' class="form-control">
	<option value=''>Semua</option>
	<option value='1' <?php if(@$_GET['id_status']==1){echo "selected";}?>>Belum Akad</option>
	<option value='2' <?php if(@$_GET['id_status']==2){echo "selected";}?>>Sudah Akad</option>
<select>
</div>

<!-- hidden variable page/halaman !-->
<input type='hidden' name='page' value='tabel'/>

  <div class="col-xs-4">
  <button type="submit" name="filter" value="filter" class='btn btn-danger glyphicon glyphicon-search'> Cari</button>
  </div>

</form>
<br></br>




            <!-- /.box-header -->
              <div class="box-body" style="overflow:auto;">
              <table id="example1" class="table table-bordered table-striped" >
                <thead>
                <tr>
                  <th>No</th>
	        	<th>Booking Fee</th>
				<th>Biaya Akad</th>
					<th>AKAD</th>
					<th>Status</th>
					<th>PROMO</th>
					<th>Keterangan</th>

                </tr>
                </thead>
                <tbody>
	        <?php
	        if($_SESSION[level]=="Sales Leader"  ){
		if($_POST[id_cabang]!=""){
		$where="where id_cabang='$_POST[id_cabang]' ";
		}else{
		$where="";
		}else{
		$where="where id_cabang='$_SESSION[id_cabang]'";
		}

$q=mysql_query("select * from nomor n, wilayah w, cabang c where
				                                                                 n.kode_wilayah=w.kode_wilayah and
				                                                                    n.id_cabang=c.id_cabang and
				                                                                    w.id_cabang=c.id_cabang and
				                                                                    c.id_cabang='$_SESSION[id_cabang]' and w.statuss3='Open' order by n.id_nomor");