The problem you reported probably means that the JS code is not being loaded for the page. take a lok at the Ajax Helper docs in the /doc/ajaxhelper in you install. In order for the package to work, you need the following changes:
The ajax helper package must be installed and mounted in /ajax . The installer should automatically mount the ajax helper in /ajax/ upon installation of the package.
Lee Denison's template::head code must be available. This code will soon be committed to CVS head after consulting the community and some more testing.
In the mean time, you can find the files you need to implement template head from packages/ajaxhlper/www/docs. You should copy the files into the following locations