Custom Navigation Bar Background for all iPhones

if([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)] ) {

        //iOS 5 new UINavigationBar custom background

        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbg_ForiPhone5_Imagename.png"] forBarMetrics: UIBarMetricsDefault];

    } else {

        [self.navigationController.navigationBar insertSubview:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navbg_ForOtherIphone_Imagename.png"]] atIndex:0];

    }