PopOut UIScrollView中的中间图像包含许多图像

I have problem in playing with the UIScrollView i am using a customImage Object class to display images on scroll view and event fire on each image i achived it all but i have to do a extra work on it as the giving image showing that the middle image is pop out and fire event for that popout image... i am confuse in it can anyone tell me how to achive this .... please told me some steps to start with it..I have problem in playing with the UIScrollView