groups and background

[UDI]

Sorry, I made a mistake.

All bg is unrelated, and control on card:
   control --> card --> bg4 |
                        bg3 |
                        bg2 v
                        bg1 --> stack

All bg is unrelated, and control is included in bg3:
               bg4 ( no message )
   control --> bg3 --> card --> stack
               bg2 ( no message )
               bg1 ( no message )

bg3 is included bg2, and control is included in bg3:
               bg1 ( no message )
   control --> bg3 --> bg2 --> card --> stack
               bg4 ( no message )

UDI
eudio at chabashira.co.jp
http://member.nifty.ne.jp/UDI/