I've done this to a 'framed' site to allow it to display the page title in a text field from each page as its loaded. I bet you can modify it to allow you to change to whatever you like.
http://bluedog.dyndns.org/bookssansfrontieres/
This was a mock-up site for a startup book importer (who decided to do more lucrative importing of sporting goods instead). This site was never completed so its just a shell, but can give you a good example of the text field changing.
My technique also changes the text field from a different frame. Its all about knowing the document object model and how to specify elements of a page.
Enjoy!
[ 10-23-2001: Message edited by: bluedog ]