Image displaying from database

[Mythotical]

I came up with my own way to pull images but the thing about is that it won't pull the image on vB4.0, here is the template and file.

Template:

<img src="download.php?catimg={vb:var cid}" height="50">

Template with pulling image data through different file other than download.php:

<img src="cat.php?img={vb:var cid}" height="50">

Keep in mind the var $cid is pulled in the download.php file while the image pull is a separate file but right now I want to attempt to combine the files into one.

File:

PHP Code:

if ($vbulletin->options['bfc_download_active']){
$img = $_REQUEST['img'];

$result = $db->query_read("SELECT cat_icon,cat_type FROM download_cats WHERE catid=" . $img); 
   while ($row = $db->fetch_array($result) ) { 
    $sid = $row['cid'];
    $type = $row['cat_type'];
    $encodeddata = $row['cat_icon']; 
    }
$data = @mysql_RESULT($result,0,'cat_icon');
$type = @mysql_RESULT($result,0,'cat_type');

header( "Content-type: $type"); 
echo $data;
} 


Code that is pulling the data for the $cid variable:

PHP Code:

$sql = $vbulletin->db->query_read("SELECT * FROM `" . TABLE_PREFIX . "download_cats` WHERE cat_active = '1'");

$total = $vbulletin->db->num_rows($sql);
$i=0;
$perrow = $total-2;

while ($row = $db->fetch_array($sql))
{
    $cid = $row['catid'];
    $cat = $row['catitle'];
    $description = $row['cat_description']; 
    $caticon = $row['cat_icon'];
        $i++;

    if ($total !== 0)
    {
  
    if ($total > $perrow){
            $catc = '</td>';
        $perrow = $perrow+2;
    } else {
$perrow = $perrow-2;
    $catc = '</td></tr><tr>';
    }
        $catb = vB_Template::create('bfc_download_cat_bit');
            $catb->register('cat_bit', $cat_bit);
            $cat_bit .= $catb->render();  
    } 


Any help much appreciated.

Thanks
Steve M