:User:Thepublicguy/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;

}

}

}

$(externISBN);