Example in the documentation would be helpful

I would love to be able to get this to work, but I seem to be missing something crucial. The buttons never show up. The button_style module is enabled.I'm using the zen 6.x-1.0 theme, which I have subthemed. In Safari, the text for the buttons shows up in some micro-font which is unreadable. If I click on the microfont when it changes to a hand, it takes me to the correct link. In Firefox 3.5.2, there is no text and there doesn't appear to be any clickable link. Neither of them show any button images, although the Page Info media tab in Firefox shows the button images as coming from the sites/default/modules/button_style/images/bkg_button-right.png location (which is where I installed the module).

I have not added any code to my theme. I switched back to the Garland theme to see if that made any difference, but it did not.

The lines I added for content were:
Resident $265

and

< s p a n >
Commuter $185
< / s p a n >

Is there something else I need to do to make this work?
Thanks!