I think the easiest thing to do is to just integrate the phpbb sessions into the phuploader.php file and if they aren't logged in, redirect them to the phpbb login. Sort of like you already have it. You could also make the script look like your forums by modifying the actual HTML within the phUploader.php script. Although it would be static..
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04' Dodge SRT-4, Mopar Stage 3, 406whp/436wtq
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