If you can send me the conversion tables/rules between Cyrillics and Latin alphabet for Serbian, I should be able to put out a preliminary test site quickly. Supporting multiple variants should be doable as well.
I have put up a test site for the Serbian language that supports Cyrillics and Latin alphabets: http://s87257573.onlinehome.us/sr/
Just for the fun of it, I also made a English version, running at http://s87257573.onlinehome.us/en/