2 splash screens?

Unity allows me to set custom image as a splash screen (which is displayed while the game is loading). Is it possible to use 2 images (for 2 separate screens) instead, each displayed for half the time or something?

Also, is it possible to display a splash screen before loading the whole game? Or is there any way to control what is displayed when and how long (before/during/after loading game)? I know I can just display an image in the first scene but this only allows me to do to stuff after loading the game.

Actually - is it loading the game or just the current scene?

Edit: Didn't specify it before - I need a portable solution/information (specifically - Android, iOS and Flash, but the more the merrier).