transparent-message

Hi
   I was trying to use Transparent flash message for my rails
application (based on prototype)as below
     http://transparent-message.xilinus.com/

    Here I put transparent_message_helper.rb in app/helpers and the
javascript in public/javascript folder..And the test code in an rhtml
file.But when i execute I am getting the error

undefined method `transparent_flash_message' for
#<#<Class:0xb74b0cc8>:0xb74b0ca0>

This is a def in the above .rb file..Is it because the file not
included?Is app/helpers not the place to put
transparent_message_helper.rb?

Please help
Sijo