Convert Native iPhone App into Web App 4 iPhone, BB &Android

We have had an iPhone developed at [login to view URL] - but would like to get it converted into an HTML5 web app that runs on the iPhone, BlackBerry and Android. Our App is a brochureware app that we want to easily (and quickly) be able to reskin and reuse for different clients. The App needs to work like a Native App on the iPhone - using HTML5 offline caching mode - and when saved as a shortcut on the HomeScreeen - should launch the app fullscreen without the Safari browser frame. Like this example [login to view URL] The web app needs to utilise each platforms features to maximise the user experience - and keep it as consistent across iPhone/BlackBerry and Android as possible. We are keen to keep the navigation transitions between pages - and the button icons across the bottom. The app is made up of the following functionality - Pages of content - with videos and photos embedded. Videos to be referenced from YouTube on the web app version - Photo Gallery slideshows to looped music (we will provide) - but user can choose. Photo Gallery to be pulled in from Flickr Gallery API - RSS News Feed - Twitter Feed - Contact form that sends email - also with google maps integration -