Using login Session credentials across main domain & subdomain (mobile)

[eluser]russ_kern[/eluser]
Hey all,

Is it possible to access session data generated via login from codeigniter between a primary domain and a subdomain? I.E. I have http://somedomain.com as my primary but I want the user to be able to freely jump back and forth between that one and http://m.somedomain.com.

I have set all the session information in the config file the same between the 2, but I still get a login screen when I jump to the mobile subdomain.

Any help would be greatly appreciated. even if the answer is that it isn't possible or is very difficult, I can start working on an alternate solution and quit messing with it.

Thanks in advance.

R