Making PNG Images Transparent?

Doesn't seem like its making the images transparent before merging them. anybody know what i'm doing wrong?

http://tacticalrpgengine.com/demo22/charcreate.php

 
 
$id = mysql_real_escape_string($_GET['id']);
 
//paperdoll parts
$result = mysql_query("SELECT dolltype, dollfname FROM paperdolling WHERE id='$id'") or die(mysql_error());
$paperdoll = mysql_fetch_object($result);
 
//session var
$_SESSION[$paperdoll->dolltype] = $paperdoll->dollfname;
 
//fix body
if(isset($_SESSION['Body']))
{
 
    $im = imagecreatefrompng("data/paperdoll/" . $_SESSION['Body']);
    $rgb = imagecolorat($im, 1, 1);
    imagecolortransparent($im, $rbg);
}
 
//fix head
if(isset($_SESSION['Head']))
{
    //if body is set, merge body and head
    if(isset($_SESSION['Body']))
    {
        //load head
        $head = imagecreatefrompng("data/paperdoll/" . $_SESSION['Head']);
        $rgb = imagecolorat($head, 1, 1);
        imagecolortransparent($head, $rbg);
        
        // Copy and merge
        imagecopymerge($im, $head, 0, 0, 0, 0, imagesx($im), imagesy($im), 25);
    }
    else
    {
        //load head
        $im = imagecreatefrompng("data/paperdoll/" . $_SESSION['Head']);
        $rgb = imagecolorat($im, 1, 1);
        imagecolortransparent($im, $rbg);
    }
}
 
//fix hair
if(isset($_SESSION['Hair']))
{
    //if body is set, merge body and head
    if(isset($_SESSION['Body']) || isset($_SESSION['Head']) )
    {
        //load hair
        $hair = imagecreatefrompng("data/paperdoll/" . $_SESSION['Hair']);
        $rgb = imagecolorat($hair, 1, 1);
        imagecolortransparent($hair, $rbg);
        
        // Copy and merge
        imagecopymerge($im, $hair, 0, 0, 0, 0, imagesx($im), imagesy($im), 0);
    }
    else
    {
        //load head
        $im = imagecreatefrompng("data/paperdoll/" . $_SESSION['Hair']);
        $rgb = imagecolorat($im, 1, 1);
        imagecolortransparent($im, $rbg);
    }
}
 
//fix clothes
if(isset($_SESSION['Clothes']))
{
    //if body is set, merge body and head
    if(isset($_SESSION['Body']) || isset($_SESSION['Head']) || isset($_SESSION['Hair']))
    {
        //load clothes
        $clothes= imagecreatefrompng("data/paperdoll/" . $_SESSION['Clothes']);
        $rgb = imagecolorat($clothes, 1, 1);
        imagecolortransparent($clothes, $rbg);
        
        // Copy and merge
        imagecopymerge($im, $clothes, 0, 0, 0, 0, imagesx($im), imagesy($im), 75);
    }
    else
    {
        //load clothes
        $im = imagecreatefrompng("data/paperdoll/" . $_SESSION['Clothes']);
        $rgb = imagecolorat($im, 1, 1);
        imagecolortransparent($im, $rbg);
    }
}
 
// Output and free from memory
header('Content-Type: image/png');
imagepng($im);
 

Code (text):

 

You may have to add this: (not sure)

imagealphablending($im, false);
imagesavealpha($im,true);

PHP: