[Zope] Sort problem

Hi, I'm trying to create a list of titles, sorted alphabetically, but want to sort ignoring initial stop words. I've set up an index for title_or_id, which works fine, but "The Resource" ends up listed under T. I've tried using a Lexicon, but these seem to only be able to be used for Text Fields, which can't be used in a sort. Is there another way to do this? Cheers Michael Davis