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That effect could have been done with jQueary, but looking at the www.zoullou.net website, they mixed the thumbs together with the javascript. There's no real easy way of doing what you want unless you redo the block or create a new block. The reason is, the thumbs are in a javascript function and not in an html element like a div. Hopefully the creators of this module will eventually put the thumbs in a div and manipulate the div instead of putting them in javascript.