Large buttons nearly final style, top-menu-bar fixed

Large buttons nearly final style, top-menu-bar fixed

Large buttons now look nearly as intended, some fallback-colors have to
be set still, note that the glow-animation looks somewhat ugly in
non-WebKit browsers and does not yet work in MS-IE or Opera (that should
change in the next months); The top-menu-bar is now fixed, so that one
has access to important functions and displays all the time.