[Zope] case insensitive searches

Hi Got a keyword index setup for searching - it's currently case sensitive. Given that the creation of keywords is 'free', I have a nice mixture of upper and lower case. Sometimes it is genuinely appropriate: London, or Ken Livingstone ... other times less so: Begging or Youth. Is it possible to amend this behavior to return both upper and lower case results? Cheers Jonathan Cheyne www.homeless.org.uk