Forum: Rails-core (closed, excessive spam) Has anyone used the thumb nail generator plugin

I set up everything from 
http://www.cleverleap.com/ruby-thumbnail-generator/.
In my view I use the  code below.

image_tag("thumb/photo.jpg",:h=>20,:w=>20)

this only displays the name of the image and not the image itself.  I
can 't find any examples of anyone using this plugin.

Has anyone used this plugin successfully and if so what is the call
used in your view to get the image?

Thanks.