javascript pop-up background color

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In OSC when you click on a product, and then click on where it says "Click to enlarge." A javascript pop-up window comes up with a white background setting. I'm running black background images. Its an annoyance, I'd like to resolve.

How do I configure it to where the javascript pop-up background is configured for black??

For those who would like to see what I mean, a sample can be seen at:
http://neonlights.com/store/catalog/product_info.php?cPath=23&products_id=33
(Click on the link that sats "Click to enlarge")

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Another thing I'd like to tweak along these lines is for the pop-up box to adjust its size to the image itself. Has anyone else done this, or know how to do this?

Your help is appreciated.