Uploading new files in the media library

Hi,

My web site is about a resteaurant. I tried to upload a new file in the media library: a new reataurant menu. Despite the fact that new file (new menu) looks correctly uploaded and that the old file (old menu) has been deleted, when I clik on the botton menu on my web site i still see the old file (old menu).
When i am still logged-in as an administrator and i clik on the menu botton i see the correct file but when i logg-out and i click on the menu botton the old file (old menu) is shown.
When i say menu i mean restaurant menu.
any suggestiong please?
thanks
kind Regards

The page I need help with: [log in to see the link]