MarketPress: Custom Buy Now Button

Hi,

I’d like to use a custom Add To Cart or Buy Now button on specific product pages for special offers. I can do it with the plugin I’m currently using but want to use marketpress for a new site due to its other capabilities.

Here is an example of the buy button I’d like to use (Scroll to the bottom of the page). http://www.modelrailwayscenery.com/print-build-model-railway-buildings-on-cd/

Many thanks

Justin