MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

if (mwCustomEditButtons) {
 
   mwCustomEditButtons[mwCustomEditButtons.length] = {
     "imageFile": "http://images.wikia.com/central/images/7/74/Button_comment.png",
     "speedTip": "Adds Category Tag",
     "tagOpen": "[[",
     "tagClose": "]]",
     "sampleText": "Category:Games"}
  }