Add Logo image to iphone globally across the Application

I need to show image(Logo) which is below the navigation bar in all my pages.

i am implementing

 @implementation UINavigationBar (CustomImage)  
 (void)drawRect:(CGRect)rect 
 {  
     UIImage *image = [UIImage imageNamed: @"logo.png"];  
     [image drawInRect:CGRectMake(self.fr开发者_Python百科ame.size.width/2, 40, 89, 42)];  
 }    

in appdelegate

it won't work out .Is this possible to use image globally or any other better way?

Add this in AppDelegate.m file

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
[self.window addSubview:navigationController.view];
UIImageView *mImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"apple_small_icon"]];
[mImage setFrame:CGRectMake(270, 5, 35, 35)];
[navigationController.navigationBar addSubview:mImage] ;
[mImage release];
}

Add this in AppDelegate.h file

UINavigationController *navigationController;

:)