Shortcut key for silkscreen layers

Hi,
I’ve checked the shortcut keys list in the preferences (Version 6) but cannot find an option for switching to F.Silkscreen/B.Silkscreen, Is there a way to access these layers from a keyboard shortcut as I’ve just bought a Quick Keys wireless macro keypad (it’s fantastic) and I would like to set a button to switch to the Silkscreen layers.

Thanks