Can i make an XML query CASE-INSENSITIVE?

using the kirupa tutorial:
http://www.kirupa.com/web/xml/examples/searchbestof.htm

how on earth would i make that a case-insensitive serch?

for example, using the searchable example (embedded in the tutorial page) -
if you search for “the”, you get one set of results.
if you search for “THE” you get a different set of results.

how can i combine the two?

thanks.

-alex-

asw000