MediaWiki:EditToolbar.js

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 if (mwCustomEditButtons) {
 
   mwCustomEditButtons[mwCustomEditButtons.length] = {
     "imageFile": "http://wiki.services.openoffice.org/w/images/7/74/Button_comment.png",
     "speedTip": "Comment visible only for editors",
     "tagOpen": "<!-- ",
     "tagClose": " -->",
     "sampleText": "Insert comment here"}
  }