Thanks a lot for the reply! Actually I didnt created this website myself(I just screenshot another website from the internet, because this is exactly the effect that i would like to do, but unfortunately dont know how to do it. I know how to do repeating group that display 8 of the photos but do not know how to display 16) I wonder what precisely do i need to do in order to create something like that? (I have 16 photos that I wish to display, but I want to have 8 displayed, and then an arrow that after the users clicked it, it will show them the other 8 photos (While staying in the same page). Thanks very much!