In Leopard the Top Menu Bar is fairly transparent and will overlay on top of the background image. For those who want to disable it the following command will do so:
write /System/Library/LaunchDaemons/com.apple.WindowServer 'EnvironmentVariables' -dict 'CI_NO_BACKGROUND_IMAGE' 1
We have seen some reports that this command didn’t work for users; therefore it is important to point out that when you’re using the command you need to unload and load the launch daemon. Or just reboot. If you later start to miss this menu bar then you can undo this change by using the following command:
defaults write /System/Library/LaunchDaemons/com.apple.WindowServer 'EnvironmentVariables' -dict 'CI_NO_BACKGROUND_IMAGE' 0
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