User:Chris.n.richardson/monobook.js

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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);