Image not update(in database image update blank value)

[eluser]Rocky Mehta[/eluser]
yes yes yes i got it i take a variable and set the value then in view page i take form_hidden and pass the hidden field value and my image update is successfully saved.
thank x for help me sir.
controller page:

Code:

$data['mchair_id']['value']=$query['chair_id'];
$data['chair_type']['value'] = $query['chair_type'];
$data['chair_image']['value']= $query['chair_image'];
$data['imagehidden']['value'] = $query['chair_image'];

view page:

Code:

<td colspan="2">
&lt;?php echo form_upload('userfile',$chair_image['value']);
       echo form_hidden('prev_image_name',$imagehidden['value']);
?&gt;

thank x once again CodeIgniter