creating an image download link - php

Question

I use wordpress cms and I am working on a little script wherein visitor could upload image, resize and download. I am stuck in the download stage. I have already written most of the code but I am unable to connect these things together to make it work somehow. First among these is a resize.php which basically resizes the image and creates a jpeg file. Here is some relevant snippet from my resize.php.
<?php
//normal validation stuff happens here
//resizing stuff happens here
//here is last part of the code that creates the resized image
$filename = uniqid();
$file = 'uploads/'.$filename.'.jpeg';
imagejpeg($new, $file, 80);
imagedestroy($new);
Second is a download.php. Here is a code in my download.php. If you see a lot of question mark in the code, that means I am sure that these are the codes I am missing.
// ????????????
$FilePath = TEMPLATEPATH. '/resize/uploads/';
$final = $FilePath . $FileName;
$size = filesize($final) ;
header("Content-Disposition: attachment; filename=\"". $FileName ."\"");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Transfer-Encoding: binary");
header('Content-Description: File Transfer');
header("Content-Length: ". $size ."");
header('Content-Type: image/jpeg');
header("Expires: 0");
header("Pragma: no-cache");
ob_clean();
flush();
echo (readfile($final));
Third is an html link I have currently on the template page, again question mark for missing code. If someone clicks the link they are supposed to get the newly created resized image file.
DOWNLOAD'
I hope you got the gist of my issue. I am having a hard time trying to figure out how these three will work together to create a download link for the recently resized image. While I am struggling for a solution myself, Please help me point out the mistakes and suggest corrections. THANKS.
FINAL UPDATE : After a few hours of effort, I have this sorted now. I did not realize earlier that the only thing I was missing was the query string and the $_GET. After I understood their role in this whole process everything was pretty easy. Later on when I downloaded the images they came out corrupt. How I sorted that I saved the corrupted files everytime, opened them up in notepad++ and checked for the error. Now my application is flawless. Of course the codes are drastically changed, now. Thanks to everyone for whatever bit of interest they took to help.