Rein a écrit :

Okay! Made the Mediawiki:editpage.js.

If I understand the js correctly there are three extra buttons made allready. For instance: addInsertButton('wikipedia/commons/1/11/Button_category.png','Category','[[Category:',']]',''); It's clear that the address is not correct. I put a button in skins/common/images and changed the address..... but nothing happens. I tried a complete url, a relative url ... but no success. What am I doing wrong?

force-refresh your browser (clear your cache) ?