Although iPhoto doesn't offer a Scripts menu of its own, you can get the same effect by using the system-wide Scripts menu. Inside the AppleScript folder within your Applications folder is a file that bears a folder icon named Script Menu.menu. Double-click this folder icon to add a system-wide Scripts menu to the right side of your menu bar. The system-wide Scripts menu provides a home for the scripts used with applications that don't provide Scripts menus of their own.