Forum:Resize thumbnails in image categories?

Simple question: is it possible to changed the size of thumbnails in an image gallery here on Wikia? I found a file named "MediaWiki:Gadget-ResizeGalleries.js" that could be created, but I have no idea how it works. There must be a way! Thanks for your help. Klow 22:37, June 22, 2010 (UTC)
 * Yes, see Help:Gallery. Photo width: widths=[number of pixels] (default/empty = 120px). -- 22:55, June 22, 2010 (UTC)