Part 2:
6. Move your second (small transparent) png. file into the editor window
7. Select this file in the editor window --> Action: Goto URL;
--> write the URL of the target file in the URL window;
--> write "_self" in the target window (to open the link in the same window)
8. Move this file in the Tree window --> underneath - the map file
(as a child) (the map file is now the parent)
9. Adjust/Move the second png file in the editor window in the correct
position (above the map and (if) text in the map).
Now it should look like e.g. "Go to - Gallery", if you move the map
(Parent) the second layer should follow (Child)
10. Add more (if required) children with moving the same file into the
editor window again