iPad and iframe cookies

I am developing a Facebook canvas application using the iframe method, because of existing infrastructure the session data is set in a cookie between each page request (including jQuery JSON requests) this all works fine in Safari, Firefox, Chrome and IE( with the P3P header being set) but not in MobileSafari on the iPad (iOS 4.2).

I've been watching the debug as each page is loaded and it seems th开发者_StackOverflowe session isn't being passed through as each page loads.

Does anyone know what it takes to get MobileSafari accepting cookies inside an iframe?

Thanks in advance! Callum

One of my friends used this and said it worked

http://anantgarg.com/2010/02/18/cross-domain-cookies-in-safari/

EDIT: updated link