User:Tdebber/monobook.js

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The accompanying .css page for this skin can be added at User:Tdebber/monobook.css.

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function externISBN() {
  for (var i = 0; i < document.links.length; i++) 
    {       
        if( document.links[i].href.match(/isbn=(.*)/) ) {
          document.links[i].href='http://www.amazon.com/exec/obidos/ASIN/'+RegExp.$1;
        }
    }

}

addOnloadHook(externISBN);