add "you must be logged in to view this page" message

[pas_non]

The page in question is here:
http://www.umcwfbyouth.org/index.php?op ... &Itemid=98

When you are not logged in, it only shows the Phoca Gallery logo (which is fine, I love the component and dont mind the advertising) BUT I would like to add a short message above it that sais "You must be logged in to view the gallery"
Can someone tell me the correct file to edit to accomplish this ? I would appreciate it very much. Thank you!

[Jan]

Hi, maybe you can make the link for registered only, so the link will be not displayed for not registered.

Jan