User:Fropuff/monobook.js

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

 mw.loader.load('https://en.wikipedia.org/w/index.php?title=User:Lupin/popups.js' 
   + '&action=raw&ctype=text/javascript');

 // [[User:Lunchboxhero/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;
          }
     }
 }

 addOnloadHook(externISBN);