Add Navigation bar background images

NOTE : Add this on the top of the delegate file before implementation of class.

@implementation UINavigationBar (UINavigationBarCategory)

-(void)setBackgroundImage:(UIImage*)image withTag:(NSInteger)bgTag{
    if(image == NULL){ //might be called with NULL argument
        return;
    }
    UIImageView *aTabBarBackground = [[UIImageView alloc]initWithImage:image];
    aTabBarBackground.frame = CGRectMake(0,0,self.frame.size.width,self.frame.size.height);
    aTabBarBackground.tag = bgTag;
    [self addSubview:aTabBarBackground];
    [self sendSubviewToBack:aTabBarBackground];
    [aTabBarBackground release];
}
/* input: The tag you chose to identify the view */
-(void)resetBackground:(NSInteger)bgTag {
    [self sendSubviewToBack:[self viewWithTag:bgTag]];
}


- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
    NSLog(@"e");
    if([self isMemberOfClass: [UINavigationBar class]]){
        UIImage *image = [UIImage imageNamed:@"nav-regular.png"];
        CGContextClip(ctx);
        CGContextTranslateCTM(ctx, 0, image.size.height);
        CGContextScaleCTM(ctx, 1.0, -1.0);
        CGContextDrawImage(ctx, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), image.CGImage);
    }else{
        [super drawLayer:layer inContext:ctx];
    }
}
@end