MediaWiki:Common.js

var kategori = {
"imageFile": "/images/b/bc/Wiki.png", // image to be shown on the button (may be a full URL too), 22x22 pixels
"speedTip": "Kod", // text shown in a tooltip when hovering the mouse over the button
"tagOpen": "[[kategori:", // the text to use to mark the beginning of the block
"tagClose": "]]",      // the text to use to mark the end of the block (if any)
"sampleText": "Ubuntu"  // the sample text to place inside the block
};
mwCustomEditButtons.push(kategori);