Using Pinterest in 'any image' and 'image hover' mode?

Hi,

I'm able to sucessfully insert and use embedded html found at http://business.pinterest.com/widget-builder/#do_pin_it_button , to use Pinterest in the 'one image' mode,

(seen here at http://neatcheeks.com/pinterest-test.html )

but I can't get Pinterest's 'any image' and 'image hover' modes to work.

The Pinterest error seems to indicate that I haven't selected a specific photo to 'pin'.

Any ideas why?

Thanks!

Gary