User:Twodeel/externISBN.js

function externISBN { var magicRegex = /MAGICNUMBER/ig; if(wgPageName != "Special:BookSources" && !(wgTitle == "Book sources" && wgCanonicalNamespace == "Project")){ for (var i = 0; i < document.links.length; i++) { if( document.links[i].href.match(/Special:BookSources\/(.*)/) ) { document.links[i].href=magicURL.replace(magicRegex, RegExp.$1); }   }  } } addOnloadHook(externISBN);