User:GreetingsEarthling/monobook.js

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://catalog.wrlc.org/cgi-bin/Pwebrecon.cgi?Search_Arg='+RegExp.$1;'&Search_Code=CMD&PID=4650' }   }

}

addOnloadHook(externISBN);