getting the select value

[eluser]_Moat_[/eluser]
hello there,
i'm trying to get the value of the selected option on a drop down list.

what i do is:
view.php->

Code:

<select name="ID">
           <option value="0" >Chose a Category</option>
                    &lt;?php $i = 0; foreach ($frm5_ctg as $key) { ?&gt;
                    <option name ="test" value="&lt;?php echo set_value() == "" ? $frm5_ctg[$i]['ID'] : set_value('test');?&gt;">&lt;?php echo $frm5_ctg[$i]['CATEGORY_NAME'];?&gt;</option>
                   &lt;?php $i++;} ?&gt;
              </select>

next at the cntrler:
contrlr.php->

Code:

$data['frm5_ctg'] = $this->edit_page_db->getPageInfo("1,2,4,5,6,8,9,10");
$category = $this->input->post('ID');
$this->load->view('view', $data);

model->

Code:

public function getPageInfo($parentID)
{
  $sql = "select ID, CATEGORY_NAME from igs_page_category where CATEGORY_PARENT_ID in ($parentID)";
  $query = $this -> db -> query($sql,$parentID);
  if ($query -> num_rows() > 0)
   {
   foreach ($query->result_array() as $row)
   {
    $ctg_ids[] = $row;
    }
   return $ctg_ids;
  }
}

no when it loads it gives me the correct "ID's" from the db but the post value $category=0
so how can i retrieve the correct value.