V

hi all!
i have a clip that have some buttons,each button open a diffrent page with some products.and from that page you clike on a close button to go back.
my problom is that when you go back you dont know wich button you preed last.
i want that each time the user is going back there will be a v on that button that he allready press.(it dosent have to be a v just a sign)

any help will be a reall help!
thanks