User:Erdos3

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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);