Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
var magicURL = "http://www.amazon.com/gp/search?ie=UTF8&field-isbn=MAGICNUMBER&tag=wikipedia08-20";
importScript('User:Lunchboxhero/externISBN.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);

//POPUPS script
// [[User:Lupin/popups.js]]

importScript('User:Lupin/popups.js');
popupFixRedirs=true;
popupRedirAutoClick='wpSave';
popupRedlinkRemoval=true;
popupShortcutKeys=true;
popupRedlinkAutoClick='wpSave';