http://www.magnusmanske.de/wikipedia/gallerypreview.png
I put it under [[MediaWiki talk:Gallerypreview.js]]. Installation instructions on the page: http://commons.wikimedia.org/wiki/MediaWiki_talk:Gallerypreview.js
Install by copying the following line to your monobook.js user sub-page:
OK so what is a monobook.js for starters, and where is a sub page I just have a user page
Wayne Ray