Upload Image in apps profile page with facebook graph API - php

Question

I am creating an app where the user can upload an image, that will be stored in apps profile page, and in the user profile. I'm using below code to do this work
<?php
$app_id = "XXXXXXXXXXXXXXXX";
$app_secret = "XXXXXXXXXXXXXXXXXXXXXXXX";
$post_login_url ="XXXXXXXXXXXXXXXXXXXXXXX";
$code = $_REQUEST["code"];
//Obtain the access_token with publish_stream permission
if(empty($code)){
$dialog_url= "http://www.facebook.com/dialog/oauth?"
. "client_id=" . $app_id
. "&redirect_uri=" . urlencode( $post_login_url)
. "&scope=publish_stream";
echo("<script>top.location.href='" . $dialog_url
. "'</script>");
}
else {
$token_url="https://graph.facebook.com/oauth/access_token?"
. "client_id=" . $app_id
. "&redirect_uri=" . urlencode( $post_login_url)
. "&client_secret=" . $app_secret
. "&code=" . $code;
$response = file_get_contents($token_url);
$params = null;
parse_str($response, $params);
$access_token = $params['access_token'];
// first get your album id, let's assume you need to create it
// create this before hand and you can just reference the id
$attachment = array('access_token'=> ACCESS_TOKEN, 'name'=>$ablum_name);
try{
$album_resp = $facebook->api("/{$this->page_id}/albums", 'POST', $attachment);
}catch(Exception $e){
throw new Exception("Failed to create album: ". $e->getMessage());
}
$album_id = $album_resp['id'];
// Show photo upload form to user and post to the Graph URL
$graph_url= "https://graph.facebook.com/photos?"
. "access_token=" .$access_token;
echo '<form enctype="multipart/form-data" action="'
.$graph_url .' "method="POST">';
echo 'Please choose a photo: ';
echo '<input name="source" type="file"><br/><br/>';
echo 'Say something about this photo: ';
echo '<input name="message"
type="text" value=""><br/><br/>';
echo '<input type="submit" value="Upload"/><br/>';
echo '</form>';
}
?>
With this code it is going to the user's profile but not to the app's profile page. Can any one please tell what is wrong with it? Or is there another way to do it?