Dynamic Object Animation

Hi,
I want to create an animation in which dynamic images are loading. there could be any number of images. And on mouse rollover there should be some effect like image size should increase.
there are two buttons left and right according to which user can view other images.
main problem is that i am not able to scroll the images properly as there could be any number of images and also size of images is different. Is there any way to keep track of this.
i want this urgently
Thanks in advance