User:Odradek5/monobook.js

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