Ella: You have to add the following to to MediaWiki:Common.js on your wikia..

<nowiki>importScriptPage('ShowHide/code.js', 'dev');

and the following code to MediaWiki:Common.css and MediaWiki:Wikia.css


 var ShowHideConfig = {
    brackets: '[[]]'
};
importScriptPage('ShowHide/code.js', 'dev');