Installed the mod on my 4.4.4 test store with no problems. One thing I noticed is that if you put a long line of text into the extra field the pop up box extends past the top header of the box.
Is there anyway to implement a scroll bar or set the box dimensions to prevent this?
Here's the link:
http://eaglemtnoutfitters.com/test/product.php?productid=17753&cat=&page=1
Click on the Details button.