Returns a list of page regions that appear in the overlay.
Overlay regions correspond to the entire contents of the overlay child window and are refreshed each time a new page request is made within the overlay.
An array of region names that correspond to those which appear in the overlay, within the theme that is being used to display the current page.
overlay_supplemental_regions()
function overlay_regions() {
return _overlay_region_list('overlay_regions');
}