"super" button in mac keyboard?

maybe this has been asked before, but i couldn't find much. i'm running beryl, which has a lot of shortcuts with the "super" key, that in windows keyboards is the "win start" key. how can i use the same shortcuts with a mac keyboard? command(apple) doesn't seem to work (ctrl and alt are ok though). oh, btw, the computer is an imac ic2d 20", so standard plain mac keyboard.

EDIT: solved i resolved it by running gnome-settings-daemon under xgl (which also fixed management of themes...)

in the gnome settings, you can change your keyboard type to "Macintosh"

yeah, i had tried that one already but it wasn't right: it refers to the old italian mac keyb, that didn't use to be qwerty, not to the new italian one, which is more standard.