User:SomeHuman/monobook.js

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The accompanying .css page for this skin is at User:SomeHuman/monobook.css.

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//Changes ISBN links to point to the here quoted url, instead of Special:Book_sources. 
// To change the destination url, simply modify the hereunder quoted url.
//Original script: Lunchboxhero's javascript page User:Lunchboxhero/monobook.js
// if you have any questions, leave a comment on its discussion page.
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);