User:Gnp/monobook.js

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// taken from [[User:Lunchboxhero/monobook.js]]

function externISBN() {

  var magicURL = "http://www.amazon.com/exec/obidos/ASIN/MAGICNUMBER/wikipedia08-20";
 
  var magicRegex = /MAGICNUMBER/ig;
  if(mw.config.get('wgPageName') != "Special:Booksources" && mw.config.get('wgPageName') != "Wikipedia:Book_sources"){
    for (var i = 0; i < document.links.length; i++) 
    {       
        if( document.links[i].href.match(/isbn=(.*)/) ) {
          document.links[i].href=magicURL.replace(magicRegex, RegExp.$1);
        }
    }
  }
}

$(externISBN);