Cara disable / hide combobox dari combobox

Assalamu'alaikum wr wb
Kali ini saya akan share bagaimana caranya hide combobox dari combobox.
Berikut ini syntaxnya
_________________________________________________________
<script language="JavaScript" type="text/JavaScript">

function showSub()
{
if (document.anggota.status.value == "dosen")
{

document.anggota.prodi.style.display = "none";
}
else if (document.anggota.status.value == "pegawai")
{

document.anggota.prodi.style.display = "none";
}
else
{
document.anggota.prodi.style.display = "block";
}
}
</script>


echo "<br>
          <form name='anggota' method=POST enctype='multipart/form-data' action=$aksi?modul=anggota&act=insert>
          <table class='list'><tbody>
          <tr><td class='left'>Nama</td><td class='left'><input type=text name='nama' style='float:left;' size='36'></td></tr>
 <tr><td class='left'>Username</td><td class='left'><input type=text name='username' style='float:left;' size='36'></td></tr>
 <tr><td class='left'>Password</td><td class='left'><input type=text name='password' style='float:left;' size='36'></td></tr>
 <tr><td class='left'>Alamat</td><td class='left'><input type=text name='alamat' style='float:left;' size='36'></td></tr>
 <tr><td class='left'>HP</td><td class='left'><input type=text name='hp' style='float:left;' size='36'></td></tr>";
     echo"<tr>
              <td>Status</td>
              <td>
<select name='status' id='status' title='Silahkan pilih Status' onChange='showSub()'>        
<option value=0>- Pilih Status -</option>
<option value=pegawai>Pegawai</option>
<option value=dosen>Dosen</option>
<option value=mahasiswa>Mahasiswa</option>
</select>                      
              </td>
          <tr>
   
<tr><td>Prodi</td>  <td>
          <select name='prodi' id='prodi'>
            <option value=0 selected>- Pilih Prodi -</option>";
            $tampil=mysql_query("SELECT * FROM tbl_prodi ORDER BY prodi");
            while($r=mysql_fetch_array($tampil)){
              echo "<option value=$r[id_prodi]>$r[prodi]</option>";
            }
    echo "</select></td></tr>    
 <tr><td class='left'>Kelas</td><td class='left'><input type=text name='kelas' style='float:left;' size='36'></td></tr>
 <tr><td class='left'>Keterangan</td><td class='left'><input type=text name='keterangan' style='float:left;' size='36'></td></tr>
 <tr><td>Aktif</td>  <td>
          <select name='aktif'>
            <option value=0 selected>- Pilih Status Aktif -</option>
<option value=Y>Y</option>
<option value=N>N</option>
 <tr><td class='left'>Gambar</td><td class='left'><input type=file name='fupload' size=40>
 <br>Tipe gambar harus JPG/JPEG</td></tr>";
           
    echo "</select></td></tr>
          <tr><td class='left' colspan=2><input type=submit style='float:left;margin-left:75px;' value=Simpan>
                            <input type=button style='float:left;' value=Batal onclick=self.history.back()></td></tr>
          </tbody></table></form>";

echo"<div id='paging'>Hal: $linkhalaman</div>";
_________________________________________________________
Semoga bermanfaat.
http://pangeran-it.blogspot.com/