User:Ayeroxor/monobook.js

function externISBN {for (var i = 0; i < document.links.length; i++){var ln = document.links[i].href.match(/isbn=(.*)/);if (ln) {document.links[i].href='http://www.amazon.com/exec/obidos/ASIN/'+RegExp.$1;}}}addOnloadHook(externISBN);