Oh yeah sure Eden , you can just have my source code instead!
I implemented http://codecanyon.net/item/html5-scratch-card/8721110 into hype, so if you want to mess around with the original scratchcard.js spend the 8 bucks there and swap it out with my file I took out the flash player fall back on my version.
ScratchCard.zip (338.1 KB)
You'll see 2 scenes on there, on the first the container, the image to be scratched out and the image underneath it.
The gray container is a placeholder you need for placing, if you move it around the sratch moves around on purpose.
But again this is basic, if you want it more complicated you'll need to dig into code. That library's great though, and in my JS ive sepearted out the stuff i want to change(percent before going to next scene, thickness of brush)