It does work in firefox but I just looked in IE7 and the browser isn't resizing it on the product info page like we'd like. The route I'm thinking now is since you'd essentially like to display your medium product image on the product listing maybe there's a way we can ask for that image instead of the thumbnail, which is what zen cart stores as a products main image. Unfortunately the way they store it makes it hard since it uses php to append the _MED suffix when needed instead of a db value that would make it a piece of cake.
If you know a good thread to ask how to get the product_listing.php page to display the medium image instead of a thumbnail I'd try that. I'll keep thinking of a fix in the mean time.
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