Problem with image upload script passing variable to php script

[Travelfrog]

PHP upload script. I am able to statically change the $target_path so that the uploads are sent to a different bzp folder. When I try to get an id from the flash index page URL such as ?id=11, the id is blank. Any ideas?

<?php
set_time_limit ( 240 ) ;

//BlueZone
$bzp_id="11"; // This Works
//$bzp_id = htmlspecialchars($_GET['id']); //This doesn't work
//BlueZone

$file=$_FILES['Filedata'];

for($k=0;$k<count($file['name']);$k++){
	$target_path = "bzp".$bzp_id."/"; //$target_path = "bzp11/";
	$target_path = $target_path . basename( $file['name'][$k]);
	$orig=$target_path;
	$info = pathinfo($target_path);
	
	$ctr=1; 
	while(file_exists($target_path)){
		$target_path=$info['dirname']."/".$info['filename'].$ctr.".jpg";//.$info['extension'];
		$ctr++;
	}
	
	if(move_uploaded_file($file['tmp_name'][$k], $target_path)) {
	   // echo "status=1&filepath=$target_path&size=".$file['size'];
	} else{
	   // echo "status=0&msg=Error";
	}

}

echo "status=1";

?>