Cufon change for custom span

Hi:

I am using Thesis as a theme and the All-in-one-cufon for my font management on the site. I created a span (“poi_headline”) and put the code into my custom.css. It worked perfectly.

Then, I tried to change the font to a cufon font with this code:
Cufon.replace(‘.poi_headline’, { fontFamily: ‘Blockography’ });

It did not work. I test the line of code by using this:

Cufon.replace(‘h1’, { fontFamily: ‘Blockography’ });

so clearly I am doing something wrong in the naming of the span or something. Please advise.