UIButton *logoButton = [[UIButton alloc] init];
logoButton.frame = CGRectMake(12, 6, 72, 33);
logoButton.opaque = NO;
logoButton.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin;
logoButton.imageView.image = [UIImage imageNamed:@"banner-pa.jpg"];

UIBarButtonItem *logoBar = [[UIBarButtonItem alloc] initWithCustomView:logoButton];
self.navigationItem.rightBarButtonItem = logoBar;
[logoBar release];
[logoButton release];