User blog comment:Dopp/Technical Update: January 24, 2012/@comment-3235402-20120125140934/@comment-3388044-20120127140344

 Roads : According to w:c:ben10fanfiction:MediaWiki:Common.js, you do import the  code from the Dev Wiki. But then, the rest of the page modifies it. It may be one of these modifications that is causing the problem.

For instance, I see from the revision history, that you’ve added some code from Wikipedia. Wikia and WP do not run the same version of the MediaWiki software. When we removed the WP  from our wiki, we were able to get it to work.

Something as simple as this should work: // Collapsible Tables importScriptPage('ShowHide/code.js', 'dev');

var autoCollapse = 2; var collapseCaption = "hide"; var expandCaption = "show"; var maxHeight = 300; // END of Collapsible Tables

In fact, I am not even sure if anything after "" is necessary.