ipad and new ipad frame

hi ,

i have frame problem in 2 ipad device.

     fUnityScrWidth = 640;
     fUnityScrHeight = 600;

     viewUnity.autoresizingMask = UIViewAutoresizingNone;

this code is working good in ipad 2 but in new ipad its not working probably frame size is changing. can anyone help me about this problem.