Changes

if (mwCustomEditButtonsmw.toolbar ) { mwCustomEditButtons[mwCustomEditButtons mw.toolbar.length] = addButton( { "imageFile": "http://uploadwww.wikimediakavitakosh.org/wikipediakk/enimages/8c/80cd/Button_upper_letterButton_poem.png", "speedTip": "Insert SuperscriptPoem tag", "tagOpen": "<suppoem>", "tagClose": "</suppoem>", "sampleText": "रचना यहाँ टाइप करें" });

mwCustomEditButtons[mwCustomEditButtons mw.length] = { "imageFile": "http://upload.wikimedia.org/wikipedia/en/1/13/Button_enter.png", "speedTip": "Line break", "tagOpen": "<br />", "tagClose": "", "sampleText": ""};  mwCustomEditButtons[mwCustomEditButtonstoolbar.length] = addButton( {

  mwCustomEditButtons[mwCustomEditButtons.length] = { "imageFile": "http://www.kavitakosh.org/kk/images/c/cd/Button_poem.png", "speedTip": "Poem tag", "tagOpen": "<poem>", "tagClose": "</poem>", "sampleText": "रचना यहाँ टाइप करें"});