User:SmartGuy/vector.js

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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);