I've been away to conferences and somehow missed these replies! Thank you all for the replies!
I send the same content, so in principle CSS definitions should be able to restyle satisfactorily. I actually found two books that seem quite helpful: by Jonathan Stark, published by O'Reilly, "Building iPhone apps with HTML, CSS, and JavaScript without ObjectiveC or Cocoa", and "Building Android apps with HTML, CSS, and JavaScript". The two books are very similar, and they describe a way to create native apps by way of creating a webapp and using PhoneGap. (We are happy enough just having a web app that looks good!!!). Thanks!! L.
