Cufon.replace('.fo_nav_m', { fontFamily: 'schriftart', color: '-linear-gradient(#616162, #000000)', hover:{color: '-linear-gradient(#b9b9ba, #636464)'}});

Cufon.replace('.fo_nav_mact', { fontFamily: 'schriftart', color: '-linear-gradient(#b9b9ba, #636464)', hover:'true' });