add parallax scrolling to slider

Hello, I would like to add an option to the free version of meta slider (nivo slider only) I would like a parallax style scroll option, which would be activated through the shortcode (so it wouldn't be for every slideshow) This is more or less an example: [login to view URL] I will try to find more examples if needed. I will send the plugin to the winning bidder as it already has had several mods. I will need further work done in the future as well. Thanks