IPhone : Scrollview with left and right arrows in IOS

I have a scrollview with set of images with left and right button. I have implement the left button action for moving the image left side using this code

 if ( scroll.contentOffset.x <= scroll.frame.size.width ) {
        CGRect frame;
        frame.origin.x = scroll.contentOffset.x + scroll.frame.size.width;
        frame.origin.y = 0;
        frame.size = scroll.frame.size;
         //NSLog(@"%f %f %f", frame.origin.y ,scroll.frame.size.width, frame.origin.x);
        [scroll scrollRectToVisible:frame animated:YES];
    }

its working perfectly

same i implement the functionality for right button action not working properly what i am doing wrong the code is below

if ( scroll.contentOffset.y <= scroll.frame.size.width ) {
        CGRect frame;
        frame.origin.x = 0;
        frame.origin.y =  scroll.frame.size.width + scroll.contentOffset.y;
        frame.size = scroll.frame.size;
          NSLog(@"%f %f %f", frame.origin.y ,scroll.frame.size.width, frame.origin.x);
        [scroll scrollRectToVisible:frame animated:YES];
    }