animation a series of images after iteration
===

I have been playing around with Xcode lately and am stuck at this stupid problem. Need help!
Okay I added 69 images to supporting files names 1.jpg,2.jpg...69.jpg. They are named so because a loop will be used to create an animation by displaying a series of images. Here is what i did.
Header file:

    #import <UIKit/UIKit.h>
    
    @interface myBitchViewController : UIViewController{
        NSMutableArray *images;
    }
    
    @property (retain, nonatomic) NSMutableArray *images;
    
    @end

And implementation file:

    #import "myBitchViewController.h"
    
    @implementation myBitchViewController
    
    @synthesize images;
    
    - (void)viewDidLoad {
        for (int imagenumber = 1; imagenumber <= 69; imagenumber++) {
            NSMutableString *myString = [NSMutableString stringWithFormat:@"%i", imagenumber];
            [myString stringByAppendingString:@".jpg"];
            [images addObject:[UIImage imageNamed:myString]];
        }
        CGRect frame = CGRectMake(0.0, 0.0, 320.0, 460.0);
        UIImageView *imageview = [[UIImageView alloc] initWithFrame:frame];
        imageview.animationImages = images;
        imageview.contentMode = UIViewContentModeScaleAspectFit;
        
        imageview.animationDuration = 3;
        
        imageview.animationRepeatCount = 0;
        
        [imageview startAnimating];
        
        [self.view addSubview:imageview];
        
        [imageview release];
        
        [super viewDidLoad];
    }
    
    - (void)viewDidUnload
    {
        [super viewDidUnload];
        // Release any retained subviews of the main view.
    }
    
    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    }
    
    @end

Now the issue is that the program doesn't throw any error but when simulator run it just shows blank grey screen instead of animation. Where am I going wrong?