problem in $this->db->or_where()

[eluser]Bigil Michael[/eluser]

function get_ordinary_search($search, $category)
{
if($search!='all'){
$this->db->like('heading', $search);
}
$this->db->where('featured', '1');
$this->db->where('status', '1');
$this->db->where('cat_id', (int)$category);
$this->db->or_where('subcat_id', (int)$category);
$result_category_newss = $this->db->get('classifieds');
return $result_category_newss->result();
}

this is the model function i used to do search.
without $this->db->or_where('subcat_id', (int)$category);
it is working well

when i use the condition

$this->db->or_where('subcat_id', (int)$category);

it shows every fields in the table

can anyone help me???/
is there any syntax problem....

please reply
thanks in advance..