:User:Chris.n.richardson/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;

document.links[i].href='http://us.bookbutler.com/do/bookCompare?searchFor='+RegExp.$1+'&amountIn=gbp&shipTo=gb&searchIn=uk';

}

}

}

$(externISBN);