Add the following to your monobook.js

function inc (file) {
  var lt = String.fromCharCode(60);
  var gt = String.fromCharCode(62);
  document.writeln(lt+'script type="text/javascript" src="/w/index.php?title='+file+'&action=raw&ctype=text/javascript&dontcountme=s"'+gt+lt+'/script'+gt);
}

inc("User:Lightdarkness/aiv.js");

And you're done! Requires firefox.